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The mkiv Supra Owners Club

loss of brake feel no sign of leaks j-spec


James d

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Hi guys i was driving my 94 gz tt on sunday and after many hours of fun in the sun i had a slow but fearful loss of brake feel like hardly any brakes, iv checked each caliper and hoses visualy by taking off the wheels but no sign of a leak.

Of course they need bleeding but was hoping any of you have some ideas as to why this has happend before i write a carte blanc to a garage, they are j-spec brakes. any help would be greatly appreciated. sorry for any spelling mistakes but writing on my phone sat next to the car.

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If you were braking heavily a lot and the brake fluid is old then youve probably just boiled

the fluid because of all the moisture in it.

 

Replace the brake fluid with Motul RBF600

 

Failing that and you have no leaks then its probably the master cylinder

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Could be the master cylinder leaking internally? How much "fun" were you having? Sure you havn't just cooked the brakes?

 

well having fun with bikes on the A24, first time iv had gsxr's move out of the way in a car but found out that the soop is limited at 120 shame shame shame well next is a thor delimiter

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HA ok,turns out to be the steel brake tube located under a cover on the near side rear, its perished. Its time to get a flange kit and some steel tubing adding plenty of time and swearing due to the limited access... wow thats next weekend gone

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I'd use copper and replace the lot

 

I think that is good advice i will replace them all and some braided hoses to boot, what about copper and nickle is that better or not much difference. does anyone know about the sizes for the soop or are all brake lines the same diameter

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I'd use copper and replace the lot

Iv read on other threads that if replacing all pipes you can get issues with the abs like air in it and the only way to remove this issue in the chamber is a very expensive tool?. Im happy to change the rear pipes but uncertain if to tackle the fronts due to this problem.... any advice ?

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