loss of brake pressure - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

n240sx · 08-16-2005, 11:05 AM

I changed my rear brake pads yesterday, bled the brakes (because I opened one of the brake lines to try and relieve pressure on a stubborn piston), took the car for a test drive and everything checked out ok. Then on the way to work today (which is about a 30-40 mile drive), when i was about a mile from my building, my brake pedal decides to lose all pressure and drops to the floor. The car did come to a stop though. Anyway, when I pulled into my parking lot, I could smell brake fluid, but when i checked to see if i lost any fluid. I didn't. Now the brakes have more pressure, but they are still fairly soft. So, i'm now sitting at work, hoping to make it home so i can try to resolve the issue.

The only thing two things that i can think of that could have caused problem are A.) didn't bleed the brakes enough or B.) when i pushed the passenger side piston into the caliper, a small section of the piston dust boot came over the top of the piston, and i left it that way. I didn't think much of it, but could this have been the problem? Any help would be appreciated.

aznpoopy · 08-16-2005, 11:13 AM

wait.

the piston rubber dust boot came over the top of the piston?

is it getting pinched between the piston and the brake pad?

that is bad dude.

edit:

oh yah. pedal to the floor = bad m/c *or* leak in the hydraulic system. since you smelled fluid, its probably a leak. so start lookin. you wont see a slow fluid loss in the m/c because it takes alot of time for the air (coming in at the source of the leak) to travel all the way up there.

gechalx · 08-16-2005, 08:59 PM

i have the exact same problem i've replaced my brake pads twice so far.. so i did some further inspection and it seems like i'm leakin brake fluid from my calipers... so now i'm going to need to buy a new set of calipers..

carkid0007 · 11-01-2005, 11:24 PM

Alright well I have this problem, Pedal goes to the floor, and I just replaced the Master Cylinder and bled the brakes and still puzzled because it didn't fix the problem...Any ideas ?, What to check and what not ?

Supreme · 11-02-2005, 01:27 AM

Had the same problem today. Did them yesterday, bled them twice and today lost pressure. When I checked, all my brake fluid was gone but I found no puddles. Surely enough it was leaking through one of the brake line connections that my friend left a bit loose. Problem solved after tightening it and bleeding it one more time.

carkid0007 · 11-02-2005, 08:54 AM

Any suggestions for getting these damn bleeders off they are so old they just wont budge....

OptionZero · 11-02-2005, 11:01 AM

Breaker bar...?

Replace them with speed bleeders while you're at it, save yourself a ton of trouble next time you bleed brakes.

Check all the bleeder screws and line connections for leakage as well.

Supreme · 11-02-2005, 12:23 PM

I broke one and couldnt remove 2 when I did mine also, too much force will surely snap it off leaving you with having to get new ones.

08-16-2005, 11:05 AM	#1
n240sx Zilvia Member Join Date: Apr 2003 Location: Huntsville, AL Age: 39 Posts: 195 Trader Rating: (15) Feedback Score: 15 reviews	loss of brake pressure I changed my rear brake pads yesterday, bled the brakes (because I opened one of the brake lines to try and relieve pressure on a stubborn piston), took the car for a test drive and everything checked out ok. Then on the way to work today (which is about a 30-40 mile drive), when i was about a mile from my building, my brake pedal decides to lose all pressure and drops to the floor. The car did come to a stop though. Anyway, when I pulled into my parking lot, I could smell brake fluid, but when i checked to see if i lost any fluid. I didn't. Now the brakes have more pressure, but they are still fairly soft. So, i'm now sitting at work, hoping to make it home so i can try to resolve the issue. The only thing two things that i can think of that could have caused problem are A.) didn't bleed the brakes enough or B.) when i pushed the passenger side piston into the caliper, a small section of the piston dust boot came over the top of the piston, and i left it that way. I didn't think much of it, but could this have been the problem? Any help would be appreciated.

11-02-2005, 01:27 AM	#5
Supreme Leaky Injector Join Date: Sep 2005 Location: Queens SQC Posts: 55 Trader Rating: (0) Feedback Score: 0 reviews	Had the same problem today. Did them yesterday, bled them twice and today lost pressure. When I checked, all my brake fluid was gone but I found no puddles. Surely enough it was leaking through one of the brake line connections that my friend left a bit loose. Problem solved after tightening it and bleeding it one more time. __________________ Signature Exceeds Forum Limits

11-02-2005, 12:23 PM	#8
Supreme Leaky Injector Join Date: Sep 2005 Location: Queens SQC Posts: 55 Trader Rating: (0) Feedback Score: 0 reviews	I broke one and couldnt remove 2 when I did mine also, too much force will surely snap it off leaving you with having to get new ones. __________________ Signature Exceeds Forum Limits

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08-16-2005, 11:13 AM	#2
aznpoopy Post Whore! Join Date: Mar 2003 Location: New Jersey Age: 44 Posts: 5,013 Trader Rating: (1) Feedback Score: 1 reviews	wait. the piston rubber dust boot came over the top of the piston? is it getting pinched between the piston and the brake pad? that is bad dude. edit: oh yah. pedal to the floor = bad m/c or leak in the hydraulic system. since you smelled fluid, its probably a leak. so start lookin. you wont see a slow fluid loss in the m/c because it takes alot of time for the air (coming in at the source of the leak) to travel all the way up there.

08-16-2005, 08:59 PM	#3
gechalx Leaky Injector Join Date: Jul 2005 Location: torrance, Ca Posts: 98 Trader Rating: (0) Feedback Score: 0 reviews	i have the exact same problem i've replaced my brake pads twice so far.. so i did some further inspection and it seems like i'm leakin brake fluid from my calipers... so now i'm going to need to buy a new set of calipers..

11-01-2005, 11:24 PM	#4
carkid0007 Zilvia Junkie Join Date: Aug 2002 Location: Ohio Age: 40 Posts: 497 Trader Rating: (1) Feedback Score: 1 reviews	Alright well I have this problem, Pedal goes to the floor, and I just replaced the Master Cylinder and bled the brakes and still puzzled because it didn't fix the problem...Any ideas ?, What to check and what not ?

11-02-2005, 08:54 AM	#6
carkid0007 Zilvia Junkie Join Date: Aug 2002 Location: Ohio Age: 40 Posts: 497 Trader Rating: (1) Feedback Score: 1 reviews	Any suggestions for getting these damn bleeders off they are so old they just wont budge....

11-02-2005, 11:01 AM	#7
OptionZero Post Whore! Join Date: Jul 2003 Location: Norcal Age: 41 Posts: 6,263 Trader Rating: (2) Rides Gallery: OptionZero Feedback Score: 2 reviews	Breaker bar...? Replace them with speed bleeders while you're at it, save yourself a ton of trouble next time you bleed brakes. Check all the bleeder screws and line connections for leakage as well.