Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres
Bled new Wilwood brakes but still spongy pedal
wabco40:
Did he use a pressure bleeder?
I've been through the same thing thinking it's the valve, master cylinder etc.
The problem with C3 brakes is there are too many places for air to get trapped.
I had the same problem with standard calipers as with Wilwood calipers.
10 psi of head pressure on the MC sorts out the problem.
jimandemma:
No pressure bleeder mate, it all comes back to that though doesn't it. I"m going to buy one and try it first I think. Problem is, where in Australia do you get one???
wabco40:
Just make one as stated in a previous post.
Garden sprayer and a flat plate to clamp onto the MC.
The plate can be a piece of steel, aluminium or maybe even wood. Just use a thin sheet of rubber as a gasket between the plate and MC. Hold it in place with a large G clamp. Then join the hose from the garden spray to a nipple on top of the plate. The nipple does not have to protrude into the reservoirs. You only need to be able to seal air pressure between the top of the fluid and the flat plate.
About 10 pumps of the sprayer should be enough for sufficient head pressure. Just keep a eye on the fluid level and don't let it run dry.
I will see if I have any pictures I can post.
bfit:
--- Quote from: jimandemma on March 13, 2018, 06:09:18 PM ---Thanks Bfit. What do you think, the valve maybe?
--- End quote ---
I have read that the proportioning valve can cause these sort of problem , I personally can’t see how.
I have not striped a valve out of a 75 model , I’m familiar with the earlier models.
Which control rear whell pressure with what I would call a modulation valve.
The spool moves to restrict the port area to the rear hence reducing the pressure.
I’m thinking do you have any line pressure valves fitted , your original calipers should have springs behind the pistons to keep the pads out .
If you have no line valve to hold residual pressure in the lines , then that can cause this problem.
What I don’t get , if I read your post correctly .
With the line clamps , soft pedal yes
Removed clamps and hard pedal . If that’s right it is odd to say the least.
I have to say I do not agree with clamping brake lines.
Now when I had wilwood calipers I did not have line valves, I always had to two tap the brakes the get a full pedal
jimandemma:
Pedal feel is the same with or without clamps
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