Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres

Bled new Wilwood brakes but still spongy pedal

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jimandemma:
I have access to gear to make a brake line. It's pulling the fluid down in the front cylinder but not the front boot on the cap as the rear.

bfit:
 but not the front boot on the cap as the rear

not sure what you mean by the above
BFit

jimandemma:
Inside the master cylinder cap there are 2 expandable rubber boots that stop fluid swishing around when the level is down. When using the pump the pedal method bleeding the rear calipers, the rear master cylinder cap boot will get sucked down with the level bled from that rear section of the master cylinder. When bleeding the fronts, the front master cylinder cap boot does not expand with the fluid drop in the front section. I have also been bleeding with the engine running, so going to try again with the engine off, no booster.

77CVT:
Seriously, try and clamp all 4 lines.  If you pedal is hard then it's not the master cylinder.  Granted, I've only ever done this on cars with a booster but should produce the same result.

bfit:
If you can make up a  line  with about enough tubing  that you can loop over the top and back into the reservoir below the fluid then you can see what’s  happening

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