Brake calipers differences - MR2 Owners Club Message Board
 
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post #1 of 9 (permalink) Old July 18th, 2019, 17:37 Thread Starter
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Brake calipers differences

Can someone clarify if the following brake information is correct, I currently have a 91 JDM n/a car, my current calipers seen very similar to 93 turbo calipers. Seem like the only difference is rotor diameter and thickness.

I currently have:
Front caliper is stamped with 36T25
Rear caliper is stamped 16V-L / 16V-R

research shows
89-91 JDM SW20 G, G-Limited, GT and GT-S

Front Right Caliper
Part Number: 47730-17090
Stamped Code: 36T25 R(36 = Piston Diameter, 25 = Rotor thickness)
Number of Pistons: 2
Pad: Unique to this caliper pair

Front Left Caliper
Part Number: 47750-17090
Stamped Code: 36T25 L (36 = Piston Diameter, 25 = Rotor thickness)
Number of Pistons: 2
Pad: Unique to this caliper pair

Front Rotor L/R
Part Number: 43512-17040 or 43512-17070
Diameter: 263mm
Thickness: 16mm
Minimum thickness: 15mm
Brake Disc Type: Internally Vented
Hub Bore Diameter: 62.1mm
Number of Holes: 5
Bolt Hole Circle :114.3mm
Hub Diameter: 142mm
Height:46.5mm

Rear Right Caliper
Part Number: 47730-17100
Stamped Code: 16V-R (16 = Rotor thickness)
Number of Pistons: 1
Pad: Same for 16V and 22V

Rear Left Caliper
Part Number: 47750-17100
Stamped Code: 16V-L (16 = Rotor thickness)
Number of Pistons: 1
Pad: Same for 16V and 22V

Rear Rotor L/R
Part Number: 42431-17030
Diameter: 263mm
Thickness: 16mm
Minimum thickness: 15mm
Brake Disc Type: Internally Vented
Hub Bore Diameter: 62.1mm
Number of Holes: 5
Bolt Hole Circle :114.3mm
Hub Diameter: 142mm
Height:46.5mm


93 TURBO have
Front caliper are stamped 36t30
Rear caliper are stamped 22V-L /22V-R

93-95 USDM SW20 MR2 TURBO AKA 93+ TURBO

Front Right Caliper
Part Number: 47730-17140
Stamped Code: 36T30 R(36 = Piston Diameter, 30 = Rotor thickness)
Number of Pistons: 2
Pad: Unique to this caliper pair

Front Left Caliper
Part Number: 47750-17140
Stamped Code: 36T30 L (36 = Piston Diameter, 30 = Rotor thickness)
Number of Pistons: 2
Pad: Unique to this caliper pair

Front Rotor L/R
Part Number: 43512-17080
Diameter: 275mm
Thickness: 30mm
Minimum thickness: 28mm
Brake Disc Type: Internally Vented
Hub Bore Diameter: 62.1mm
Number of Holes: 5
Bolt Hole Circle :114.3mm
Hub Diameter: 145.8mm
Height:47.5mm

Rear Right Caliper
Part Number: 47730-17130
Stamped Code: 22V-R (22 = Rotor thickness)
Number of Pistons: 1
Pad: Same for 22V and 16V

Rear Left Caliper
Part Number: 47750-17130
Stamped Code: 22V-L (22 = Rotor thickness)
Number of Pistons: 1
Pad: Same for 22V and 16V

Rear Rotor L/R
Part Number: 42431-17060
Diameter: 281mm
Thickness: 22mm
Minimum thickness: 21mm
Brake Disc Type: Internally Vented
Hub Bore Diameter: 62.1mm
Number of Holes: 5
Bolt Hole Circle :114.3mm
Hub Diameter: 142mm
Height:46.5mm

Thanks
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post #2 of 9 (permalink) Old July 18th, 2019, 22:34
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As far as I know the US market was unique in that the NA here got single piston front calipers. The rest of the world got the same 2 piston calipers that we got on the Turbo. Then in 93+ (92+ for the rest of the world) the Turbo got the bigger brakes in the US, while the NA kept it's same old single piston front calipers.

So what you have are what we in the US would normally call 91 Turbo brakes. Smaller and thinner than 93+ Turbo brakes as you noted, but with 2 piston front calipers.


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post #3 of 9 (permalink) Old July 18th, 2019, 22:44
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As far as rear pads, all Mr2 AW SW and ZZW use the same rear pads for all years and all models.
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post #4 of 9 (permalink) Old July 19th, 2019, 02:42 Thread Starter
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Thanks for clarifying that,

I have one other question about the master cylinder, it appears there is only a 2mm increase in bore size on the 93 turbo, do you think you will be able to feel the difference, maybe just a stiffer pedal?

Master cylinders:
1991-1995 NA & 1991-1992 Turbo 7/8" bore size (~22mm)
1993-1995 Turbo 15/16" bore size (~24mm)
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post #5 of 9 (permalink) Old July 19th, 2019, 05:09
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On my 1993 NA chassis I went from 7/8" bore to 1" bore and you can definitely feel something is up. Braking force starts to apply sooner with shorter pedal travel and the pedal feel is stiffer/more resistance. Net net is you can apply more braking force quicker but it's not too touchy. I am very pleased with it.

The part I used is a direct fit and it's available from these vehicles:
TOYOTA 4RUNNER 1991-1992
TOYOTA PICKUP 1991-1995
TOYOTA T100 1993-1994

OEM P/N: 4720104020, 4720130010, 4720130020, 4720134010, 4720135660, 4720135670, 472013D010, 472013D020, 4720160540, 4720160570
A/M: DORMAN M39996, Raybestos MC39996, etc.

The reservoir from MR2 is a perfect fit on the cylinder.

These are all LHD and non-abs. I don't know what would be the RHD equivalent - they have the ports on opposite sides. And I don't know about the availability of ABS MC's they have a different port configuration.

There was a discussion of this spanning more than 10 years in this thread.
https://www.mr2oc.com/64-mk2-suspens...ake-pedal.html
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post #6 of 9 (permalink) Old July 23rd, 2019, 20:50
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Quote:
Originally Posted by rdmr2 View Post
Can someone clarify if the following brake information is correct, I currently have a 91 JDM n/a car, my current calipers seen very similar to 93 turbo calipers. Seem like the only difference is rotor diameter and thickness.

I currently have:
Front caliper is stamped with 36T25
Rear caliper is stamped 16V-L / 16V-R

research shows
89-91 JDM SW20 G, G-Limited, GT and GT-S

Front Right Caliper
Part Number: 47730-17090
Stamped Code: 36T25 R(36 = Piston Diameter, 25 = Rotor thickness)
Number of Pistons: 2
Pad: Unique to this caliper pair

Front Left Caliper
Part Number: 47750-17090
Stamped Code: 36T25 L (36 = Piston Diameter, 25 = Rotor thickness)
Number of Pistons: 2
Pad: Unique to this caliper pair

Front Rotor L/R
Part Number: 43512-17040 or 43512-17070
Diameter: 263mm
Thickness: 16mm
Minimum thickness: 15mm
Brake Disc Type: Internally Vented
Hub Bore Diameter: 62.1mm
Number of Holes: 5
Bolt Hole Circle :114.3mm
Hub Diameter: 142mm
Height:46.5mm

Rear Right Caliper
Part Number: 47730-17100
Stamped Code: 16V-R (16 = Rotor thickness)
Number of Pistons: 1
Pad: Same for 16V and 22V

Rear Left Caliper
Part Number: 47750-17100
Stamped Code: 16V-L (16 = Rotor thickness)
Number of Pistons: 1
Pad: Same for 16V and 22V

Rear Rotor L/R
Part Number: 42431-17030
Diameter: 263mm
Thickness: 16mm
Minimum thickness: 15mm
Brake Disc Type: Internally Vented
Hub Bore Diameter: 62.1mm
Number of Holes: 5
Bolt Hole Circle :114.3mm
Hub Diameter: 142mm
Height:46.5mm


93 TURBO have
Front caliper are stamped 36t30
Rear caliper are stamped 22V-L /22V-R

93-95 USDM SW20 MR2 TURBO AKA 93+ TURBO

Front Right Caliper
Part Number: 47730-17140
Stamped Code: 36T30 R(36 = Piston Diameter, 30 = Rotor thickness)
Number of Pistons: 2
Pad: Unique to this caliper pair

Front Left Caliper
Part Number: 47750-17140
Stamped Code: 36T30 L (36 = Piston Diameter, 30 = Rotor thickness)
Number of Pistons: 2
Pad: Unique to this caliper pair

Front Rotor L/R
Part Number: 43512-17080
Diameter: 275mm
Thickness: 30mm
Minimum thickness: 28mm
Brake Disc Type: Internally Vented
Hub Bore Diameter: 62.1mm
Number of Holes: 5
Bolt Hole Circle :114.3mm
Hub Diameter: 145.8mm
Height:47.5mm

Rear Right Caliper
Part Number: 47730-17130
Stamped Code: 22V-R (22 = Rotor thickness)
Number of Pistons: 1
Pad: Same for 22V and 16V

Rear Left Caliper
Part Number: 47750-17130
Stamped Code: 22V-L (22 = Rotor thickness)
Number of Pistons: 1
Pad: Same for 22V and 16V

Rear Rotor L/R
Part Number: 42431-17060
Diameter: 281mm
Thickness: 22mm
Minimum thickness: 21mm
Brake Disc Type: Internally Vented
Hub Bore Diameter: 62.1mm
Number of Holes: 5
Bolt Hole Circle :114.3mm
Hub Diameter: 142mm
Height:46.5mm

Thanks
That's my research! Glad it kind of came in use. What AlexW clarified is correct.

Quote:
Originally Posted by merryfrankster View Post
On my 1993 NA chassis I went from 7/8" bore to 1" bore and you can definitely feel something is up. Braking force starts to apply sooner with shorter pedal travel and the pedal feel is stiffer/more resistance. Net net is you can apply more braking force quicker but it's not too touchy. I am very pleased with it.

The part I used is a direct fit and it's available from these vehicles:
TOYOTA 4RUNNER 1991-1992
TOYOTA PICKUP 1991-1995
TOYOTA T100 1993-1994

OEM P/N: 4720104020, 4720130010, 4720130020, 4720134010, 4720135660, 4720135670, 472013D010, 472013D020, 4720160540, 4720160570
A/M: DORMAN M39996, Raybestos MC39996, etc.

The reservoir from MR2 is a perfect fit on the cylinder.

These are all LHD and non-abs. I don't know what would be the RHD equivalent - they have the ports on opposite sides. And I don't know about the availability of ABS MC's they have a different port configuration.

There was a discussion of this spanning more than 10 years in this thread.
https://www.mr2oc.com/64-mk2-suspens...ake-pedal.html
For JDM we can use the same master but we call them Hilux and we can also get Previa van masters. I used a 1" for a while, quite a stiff pedal and worked well on the track but I have now gone down to the 15/16 master for a bit longer pedal and less foot pressure. Still beats the 7/8 master for pedal travel but you need to push harder to get the same force.

I have a 1990 JDM G-Limited with a full 1994 G-Limited brake upgrade (pretty much 93+ Turbo brakes) except for the booster. I do use a 1993 GEN3 GT prop valve.

Last edited by GDII; July 23rd, 2019 at 23:45.
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post #7 of 9 (permalink) Old July 24th, 2019, 18:27
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Quote:
Originally Posted by rdmr2 View Post
Thanks for clarifying that,

I have one other question about the master cylinder, it appears there is only a 2mm increase in bore size on the 93 turbo, do you think you will be able to feel the difference, maybe just a stiffer pedal?

Master cylinders:
1991-1995 NA & 1991-1992 Turbo 7/8" bore size (~22mm)
1993-1995 Turbo 15/16" bore size (~24mm)
The M/C bore increase was to offset the pedal force change (reduction) that occurred as a result of the larger diameter rotors.

Since increasing the rotor diameter caused an increase in brake torque for the same line pressure, Toyota wanted to keep the pedal effort roughly the same for a given braking deceleration force. In order to do that, they had to lower the line pressure to offset the torque increase to keep the pedal effort the same and the only way to do that is to increase the bore size of the M/C.

Basically, if they left it, the brakes would have become more touchy (basically want to grab quicker and harder than they did in the early setup. This is undesirable, especially in any type of performance application.
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post #8 of 9 (permalink) Old August 8th, 2019, 01:02
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Hi All,
In post #3 above merryfrankster has said that all rear pads are the same.
Some time ago I had to replace rear pads on my Australian delivered 1996 SW20 NA Bathurst.
When I researched pads to buy, I found Bendix offered the DB405 & DB1260 as pics below.
My recollection is that the DB 1260 were for the 93+ models, so I bought those.
When I came to do the job, I found that my old pads had worn unevenly.
When I compared the old pads & the new pads, I found that the new pads had the larger locating pin, which can be seen on the pics, as the only apparent difference, between the DB405 & the DB1260.
The DB 1260s fitted fine into the slots on my calipers.
I reckon that the old pads may have been DB405 & they had been able to move around a little, which may have caused the uneven wearing.
I trust that this is helpful.

Attachments don't appear to be uploading, so maybe go to Bendix website to view pics of DB405 & DB1260
Attached Images
File Type: jpg DB405.jpg (79.3 KB, 2 views)
Attached Files
File Type: pdf DB405.pdf (46.5 KB, 1 views)
File Type: pdf DB1260_Inner_Outer.pdf (72.9 KB, 1 views)
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post #9 of 9 (permalink) Old August 8th, 2019, 14:56
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Quote:
Originally Posted by Peter zzzz H View Post
Hi All,
In post #3 above merryfrankster has said that all rear pads are the same.
Some time ago I had to replace rear pads on my Australian delivered 1996 SW20 NA Bathurst.
When I researched pads to buy, I found Bendix offered the DB405 & DB1260 as pics below.
My recollection is that the DB 1260 were for the 93+ models, so I bought those.
When I came to do the job, I found that my old pads had worn unevenly.
When I compared the old pads & the new pads, I found that the new pads had the larger locating pin, which can be seen on the pics, as the only apparent difference, between the DB405 & the DB1260.
The DB 1260s fitted fine into the slots on my calipers.
I reckon that the old pads may have been DB405 & they had been able to move around a little, which may have caused the uneven wearing.
I trust that this is helpful.

Attachments don't appear to be uploading, so maybe go to Bendix website to view pics of DB405 & DB1260
Toyota does list 2 separate part numbers for the pad kits for the 16V and 22V as well as listing 2 separate part numbers for the pistons. So this is probably true with things not fitting right. Quite a few manufactures only make one pad for both years though. The pin only stops the piston from rotating and the piston would be placing all the pressure on the back of the pad unless the pin is longer and not letting it seat properly.
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