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Rear Disc Conversion 7th Gen

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g'day,

 

had finish the complete rear brake swap today. except i could not run it because of the spongy/long brake pedal travel. had gone back to the wreckers yesterday to remove from the donor car the master cylinder and the pressure modulating valve and the metering valve and replace the stock set-up but the problem would not go. bleed the master cylinder and the wheel calipers which all air is purge but same problem in fact had consumed 1 litre of brake fluid for this :( . a mechanic friend of mine drop by to check my job and could not find a fault, but he is very sure there is an internal leakage in the brake master cylinder (fluid is passing thru the piston).

 

had called up the parts store today but they dont have a stock for a repair kit and could not get the parts needed because there parts source is close during sunday.

 

what i did today,finish up the park brake installation (works perfect) and remove the donor car master cylinder from the car, dsassemble and check the inside components. the inside bore is perfect no scratches and scoring except the rubber on the front piston is very soft that you could not feel any resistance when you slide in the bore.

 

also do the same w/ the stock master cylinder when i disassemble it but find out that bore diameter is bigger compare to the donor car.

 

the donor car master bore dia is 13/16" while the stock is 7/8" diameter. all other shape and dimensions are similar. also the pressure modulating valve hole diameters of the donor is around 2mm while the stock is around 1.5mm.

 

because of this i am contemplating to use the stock master cylinder given the fact that the AE112 corolla is a little bit heavier w/ the AE102.

 

i want to ask your concession and advise w/ this guys am i doing the right thing in here?

 

rey t

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jst had my brake fix. the problem i had is i install the left caliper to the right and the left to the rear. all the the bleeder valve is facing downward, because of this even though when you bleed the brakes and you got no air present, the fluid is unable to occupy the whole caliper fluid chamber. (thanks w/ the help of a new friend which happen to be a very good and experienced mechanic).

 

i also ask him if i will reinstall the stock 7/8 inch master cylinder (i install the 13/16" from the donor car), he told me i that i will experience a different pedal feel (softer pedal). the 13/16" feels a little bit sensitive because it create more pressure. (venturi effect).

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Good stuff there - thanks for posting the progess on your brake swap saga.

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Now that your taking about brakes, I have an offer out there for everyone that has an 8th gen corolla. I recently talked to Jerry from the design and engineering department at Brembo. He will manufacture a kit for the 98 corolla for me, the catch is I have to purchase 6 kit from him. But I only need one. The kit consists of a 13inch drilled and slotted rotors in the front with a 6 piston caliper, and the same 13in rotor in the rear with a 4 piston caliper. We aren't sure yet but you might still be able to retain the E-Brake function, the only mods you would have to do to the car is remove your OE Master cylinder and replace it with a dual one. If any one is interested just post a reply here and I will consider purchasing the kits from him.

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Did Brembo give you a estimate on what this will cost - I'm guessing $3K - $4K in quantities? Wilwood also had a deal with 8th gen big brake kit upgrades and rear disc conversions - prices were very reasonable, starting at $1600 for a kit.

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Yes, and if you want a kit you will need some deep pockets, as it will cost me aporx. $8,250.24 per kit or approx. $49,501.44 for all six, keep in mind that is for all 4 wheels. There is one more thing on fitment you will need atleast 18'' wheels to clear the calipers. I'll keep you posted to to see if i can harras him to give me a better deal as I see that wilwood has stepped up to the plate.

Edited by Marcos

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