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

Bled new Wilwood brakes but still spongy pedal

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jimandemma:
I've got a hard pedal with engine off, soft to floor when running. Thinking maybe a booster problem now or vacuum

bfit:
That’s interesting,
Have to think about that

bfit:
I'm wondering if that noise you heard was the booster?

I think you need to block the master cylinder at the master cylinder, and see if you can get a peddle with and with out the engine running.
a couple of dummy lines  with the tube silver soldered closed.
T prove that section is working correctly.
Bfit

jimandemma:
Noise seemed to come from underneath the car, maybe the proportional valve. What I can't understand is the system was perfect before the brake change. I'll try another bleed this time with engine off, then also check for vacuum leaks at the booster. It's looking like I'll require a professional to come out and diagnose.

bfit:
1 when you have a good pedal, hold the brake hard down with your foot, and start the engine
the peddle should push back against your foot as the vacuum builds up. but not drop .
let us know

2 what brake hoses did you use? you said earlier they are braded but what kind and what size.

3 what was your pedal like before you changed the callipers ( what was the travel short or go nearly all the way to the floor)

4 something else to check
 loosen the master cylinder  push it forward a little and see if there is a fluid leak back into the master cylinder.

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