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Castle_mike

New Member
Joined
Jul 9, 2020
I have an 87 grand national that we just installed vacuum booster and wildwood master cylinder, as well as wilwood front and rear disc brakes. I've tried bleeding and with vacuum disconnected the pedal feels solid but as soon as I connect vacuum it gets spongy and wont Honda under brake torque, any suggestions?
 
Try changing your brake proportioning valve to a disc / disc unit .
Install 2# Wilwood residual pressure valves in your brake lines and Bleed-Bleed-Bleed.

I ended up buying a Motive pressure bleeder which worked great for me.
 
I already replaced the proprtioning valve but I'm going to order the residual pressure valves and pray that works. Thanks!
 
Are you using a hose into a catch bottle like a empty jar so you aren't sucking air back in? Do you have a block of wood under the pedal so your helper isn't over stroking the mc? Does your helper understand that they need to hold the pedal and not let it come back up until you close the bleeder?
 
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