Wilwood dual piston rear brakeswont bleed at all? - Team Camaro Tech
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post #1 of 3 (permalink) Old Sep 9th, 19, 07:21 PM Thread Starter
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Harry
 
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Wilwood dual piston rear brakeswont bleed at all?

Installed new rear calipers , master and vacuum booster and prop valve (wildwood adjustable)
so using aspirator to bleed the brakes the fronts are great but rears are not getting fluid coming out the bleeders.
I disconnected the banjo bolt and fluid leaks out as it should.
took bleeder completely off both top and bottom. and gravity bled overnight.
Still not a spot of brake fluid? seems like both calipers have a blockage?
never had this hard a time bleeding brakes geez.


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post #2 of 3 (permalink) Old Sep 9th, 19, 07:59 PM
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Re: Wilwood dual piston rear brakeswont bleed at all?

Those banjo bolts have holes in them so the fluid can get in the caliper?

It sounds like you have fluid up to the caliper but nothing in it. I look at those bolts first and the hole they thread into second.

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post #3 of 3 (permalink) Old Sep 11th, 19, 07:35 AM
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Re: Wilwood dual piston rear brakeswont bleed at all?

check pushrod length, the pushrod from booster to master cyl can be too long, which keeps the rear MC piston pushed in a tiny bit. This prevents the rear piston from uncovering the replenishment port to the rear reservoir. It also prevents the rear bore from being filled and so it can't pump fluid to the rear brakes.
Clearance should be .010" you can grind it shorter.
Be aware there is a long and short pushrod and a deep and shallow master cyl piston.
The pushrod just pulls out.
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