Fluid continues to trickle out when brake pedal is released.

LAKOTA

MEMBER
2010 CHEVROLET S-10

Chevy S-10, 89, 100K, V6

Three months ago I replaced the calipers, rotors, pads, on the front brakes and the cylinders, drums, shoes on the rear brakes. I also replaced the master cylinder and the combo valve (4WAL). The truck sat idle until a week ago. During that time we had a month of rain. The truck sat out side on a dirt driveway.

Now the brake pedal only travels about 2" and feels hard. Good vacuum, booster working ok. I opened the bleeders in the front, good squirt, pedal goes to the floor. I opened the bleeders in the rear and pedal feels hard and fluid trickles out. I opened the "T" connector at the rear and pedal feels hard and fluid trickles out. Fluid continues to trickle out when brake pedal is released. In both rear tests pedal did not go to the floor. Master cylinder checks ok.

3 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Does the truck have a height sensing valve in back? If not combination valve is not centered. If it does the system needs to be bled with an ABS scanner that can open the valves internally in the BAS head unit. This guide can help.

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please run down this guide and report back.