Help Brakes keep locking up!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Brye · 10-21-2009, 04:57 PM

I'm having the same problem.

I've changed the brake booster, master cylinder, and brake booster check valve. All at the same time.

It used to lock up only at high speed sprints, and stop and go traffic. Now, it's just driving it locks up.

I'm thinking it's pulling too much vacuum but I don't know how to check how much vacuum it's pulling, and how much it should pull.

I'm having to pull the vacuum hose from the check valve on the booster side to release the brakes. So, I'm guessing it's retaining vacuum on the booster side.

10-21-2009, 04:57 PM	#1
Brye Join Date: Mar 2008 Location: Brewton,AL Age: 36 Posts: 23 Trader Rating: (1) Feedback Score: 1 reviews	I'm having the same problem. I've changed the brake booster, master cylinder, and brake booster check valve. All at the same time. It used to lock up only at high speed sprints, and stop and go traffic. Now, it's just driving it locks up. I'm thinking it's pulling too much vacuum but I don't know how to check how much vacuum it's pulling, and how much it should pull. I'm having to pull the vacuum hose from the check valve on the booster side to release the brakes. So, I'm guessing it's retaining vacuum on the booster side.