help, brakes braking on their own... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

WongFeiHung · 01-21-2005, 12:34 PM

Installed a new master cylinder lasnight...coming back from lunch at work today, I notice the car is braking while I'm driving...get to work, the front rotors are very hot, so I think its just the front calipers are compressed...

Eh? Too much pressure in the lines? Maybe I can just relieve pressure and re bleed...? What would cause that?

Kato

ledzeppelin240 · 01-21-2005, 02:30 PM

Siezed calipers...The pressure is not the problem brakes run from 1000psi to 5500psi. It is most likely siezed calipers...

WongFeiHung · 01-21-2005, 02:40 PM

The calipers were not siezed before I put the new master cylinder, I think the new master cylinder might not be releasing pressure for some reason...

ledzeppelin240 · 01-21-2005, 02:43 PM

Hmmm, have you checked for any lines that might be bent or crimped? Or it could be a internal MC problem.

cdlong · 01-21-2005, 04:30 PM

it may not be coming out all the way, if the MC pushrod doesn't retract all the way the opening into the resivor won't open up and the pressure won't equalize like it's supposed to. check the pedal and the booster pushrod. there's a write up around here somewhere on the pushrod thing.

01-21-2005, 12:34 PM	#1
WongFeiHung Zilvia Member Join Date: Jun 2003 Location: Dallas, TX Posts: 221 Trader Rating: (0) Feedback Score: 0 reviews	help, brakes braking on their own... Installed a new master cylinder lasnight...coming back from lunch at work today, I notice the car is braking while I'm driving...get to work, the front rotors are very hot, so I think its just the front calipers are compressed... Eh? Too much pressure in the lines? Maybe I can just relieve pressure and re bleed...? What would cause that? Kato __________________ www.projectnissan.com

01-21-2005, 02:30 PM	#2
ledzeppelin240 Zilvia Addict Join Date: Sep 2003 Location: Sinse Posts: 688 Trader Rating: (0) Feedback Score: 0 reviews	Siezed calipers...The pressure is not the problem brakes run from 1000psi to 5500psi. It is most likely siezed calipers... __________________ Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power. Looking for: JDM S13 OEM Sideskirts

01-21-2005, 02:40 PM	#3
WongFeiHung Zilvia Member Join Date: Jun 2003 Location: Dallas, TX Posts: 221 Trader Rating: (0) Feedback Score: 0 reviews	The calipers were not siezed before I put the new master cylinder, I think the new master cylinder might not be releasing pressure for some reason... __________________ www.projectnissan.com

01-21-2005, 02:43 PM	#4
ledzeppelin240 Zilvia Addict Join Date: Sep 2003 Location: Sinse Posts: 688 Trader Rating: (0) Feedback Score: 0 reviews	Hmmm, have you checked for any lines that might be bent or crimped? Or it could be a internal MC problem. __________________ Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power. Looking for: JDM S13 OEM Sideskirts

01-21-2005, 04:30 PM	#5
cdlong Nissanaholic! Join Date: Jun 2003 Location: Colorado Springs Age: 44 Posts: 1,865 Trader Rating: (0) Rides Gallery: cdlong Feedback Score: 0 reviews	it may not be coming out all the way, if the MC pushrod doesn't retract all the way the opening into the resivor won't open up and the pressure won't equalize like it's supposed to. check the pedal and the booster pushrod. there's a write up around here somewhere on the pushrod thing. __________________