Alright so I need a little help, I have a 99 Civic DX sedan D16Y7 automatic. My brakes are locking up after driving maybe 10-15 minutes to the point it stops car but if I pull the vacuum hose with check valve off the brake booster side it releases the calipers and I can get home. I’m truly lost and don’t know really where to go next. Maybe Master Cylinder?? It’s about the only thing left aside from prop valve

I’ve replaced calipers, rotors, pads(twice due to locking up), rubber soft lines, brake booster, and vacuum hose with check valve(Brand new OEM Honda check valve). The brakes bled just fine. I need help!

 

Did you replace the booster or master cylinder? or mess with the brake pedal?


Edit: I see you replaced the booster. Did you match the booster to the master cylinder?

 

I set the new booster to where the OEM booster was on the pushrod. The brakes in the morning go almost to floor but still have good brakes to stop but once I get to work which is approx 10 minutes away I have to pull the vacuum line off booster and it’ll release the calipers and I’m good to go for a little bit

 

Weird. You didn't somehow flip the booster line around so the check valve is the wrong way, did you?

 

Nope, it’s going the right way. I’m completely stumped by it I’ve never had this issue before

 

you set it wrong