Rear brake issue after hydroboost

usar17 · May 21, 2019

4-5 years ago I swapped in the hydroboost unit from a newer Chevy commercial van. I also swapped the brake proportioner out to an aftermarket disc/disc model. I have a 14bolt rear with disc brake conversation that has the 1/2 ton front discs.

Since doing all this I have had constant issues with my rear brakes; Fast wearing pads, easy rear lock up on rainy days, warped rotors, hot hubs, rear hop, and squeaking. Seems like I'm getting way too much pressure to the rear.

Did I miss something? Wrong proportioned valve? I plan to swap the rear out again for a newer 2000+ 14bolt axle this summer. IDK if the newer double calibers will do better.

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climb-101 · May 21, 2019

i just set my crew cab up with hydro brakes and i just ran new lines to the front 2 and one to the rear. In the back before the drop to the rear alxe i just added an after marker portioning valve so i can set the rears

usar17 · May 21, 2019

I may need to add that. Thx

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dvdswan · May 21, 2019

I could be wrong but a van may have a different proportioning valve than a truck

usar17 · May 21, 2019

I only put in the hydroboost/master cylinder. The proportioner was an aftermarket for GM trucks

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77 K20 · May 21, 2019

I did the rear brake conversion, used a disc/disc master cylinder, used a disc/disc aftemarket combo(proportional) valve and had the same problems as you. Mine would even lock up on dry pavement. I too added an adjustable valve inline with the rear brakes. It isn't perfect, but a lot better than it was before.

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usar17 · May 21, 2019

Thanks! I figured I was just getting way too much pressure to the rear

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Frankenchevy · May 21, 2019

Weird, mine never locks up, but I do feel like one of my rear rotors has a slight warp. It’s been there since before swapping to a disc-disc prop valve.

I’m going to get new rotors and rebuild my 14bff hubs with new bearings, races, etc. and hope it cures it.

usar17 · Jun 11, 2019

Adding the manual proportion valve was gold! Fixed a lot of issues as I dialed it in. Thank you!!!

Swapping the front brake calipers to the 3/4 tons, is it as simple as just the caliper and the hose? Since I believe the banjo is different

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TPISly-C10 · Sep 27, 2019

usar17 i want to upgrade my oem 86 HB to a newer (2005) too can you tell me how you do it? since my old HB got a input master hole smaller i can't just swap the 2005 master and reservoir ( master too big wont fit small input hole from the old one) i see that newer HB got diffente mounting plate....can i swap my old mounting plate to the newer HB unit? thx for the help!

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climb-101 · Sep 27, 2019

i pulled the plate off the newer master and made a new plate that mounts to the factory studs. I also cut the loop off the rod and threaded it since it needed to be longer to reach the stock pedal. I measured the distance from the pivot point to the mounting point for the rod on the truck i got the hydrobost from and made it the same also.

Rear brake issue after hydroboost

usar17

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Frankenchevy

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