Brakes locking up (all 4) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Slims · 10-03-2011, 05:06 PM

This is driving me bat-shit crazy. My brakes keep locking up, not just one, or two, but all four. I want to say its a pressure issue with the master. the master cylinder was replaced. after this started happening, so unless both are bad??... I can use the ebrake all day, and ill be good. The second I step on the pedal they start to tighten up and get smoking hot. I took the pins out and made sure they were not sticking and re-greased them all. a few were stuck but I pulled them and cleaned it all. gave me no resistance when put back in.

when they locked up today, opened the bleeder valve on the front passenger side. the pressure in the system shot out when i cracked it. after that all 4 spun fine. I took it around again, and it stayed soft for a few miles. after breaking a few more corners, they tightened up again. i went to the front drivers side and cracked the bleeder. same thing happened, pressure shot some fluid out and they turned fine. did this with the back as well, same result.

I don't think the lines are collapsed, since i replaced the front two. it seems like its all pointing to the master, any other suggestions or ideas?

breaks have been properly flushed and bled. still no change.

10-03-2011, 05:06 PM	#1
Slims Zilvia Member Join Date: Jan 2011 Location: Solvang CA Posts: 245 Trader Rating: (2) Feedback Score: 2 reviews	Brakes locking up (all 4) This is driving me bat-shit crazy. My brakes keep locking up, not just one, or two, but all four. I want to say its a pressure issue with the master. the master cylinder was replaced. after this started happening, so unless both are bad??... I can use the ebrake all day, and ill be good. The second I step on the pedal they start to tighten up and get smoking hot. I took the pins out and made sure they were not sticking and re-greased them all. a few were stuck but I pulled them and cleaned it all. gave me no resistance when put back in. when they locked up today, opened the bleeder valve on the front passenger side. the pressure in the system shot out when i cracked it. after that all 4 spun fine. I took it around again, and it stayed soft for a few miles. after breaking a few more corners, they tightened up again. i went to the front drivers side and cracked the bleeder. same thing happened, pressure shot some fluid out and they turned fine. did this with the back as well, same result. I don't think the lines are collapsed, since i replaced the front two. it seems like its all pointing to the master, any other suggestions or ideas? breaks have been properly flushed and bled. still no change.