Brake Puzzler - ZR-1 Net Registry Forums

jcruz · 09-05-2011

I just got done swapping out the front brake pads on my 92 and I've run into a situation I never encountered before:

Every time, after bleeding the RR and the LR, the pedal would be nice and stiff. Then, I'd jump over to the RF and the pedal would go soft again. WTH? Obviously, some air is getting back into the lines. Could it possibly be the bleeder screw needs to be replaced? Any other ideas?

Thanks,

John

VetteMed · 09-05-2011

I've had similar difficulty from running the master dry and sucking some air in... I've bled the master in those cases and it seemed to help.

gbrtng · 09-06-2011

Quote:

Originally Posted by jcruz

I just got done swapping out the front brake pads on my 92 and I've run into a situation I never encountered before:

Every time, after bleeding the RR and the LR, the pedal would be nice and stiff. Then, I'd jump over to the RF and the pedal would go soft again. WTH? Obviously, some air is getting back into the lines. Could it possibly be the bleeder screw needs to be replaced? Any other ideas?

Thanks,

John

92s and newer have traction control and I think the bleeding procedure
is different than for the earlier non-TC vehicles. Or it may have to do with a different ABS modulator - somebody with a 92 or newer please jump in.

VetteMed · 09-06-2011

Quote:

Originally Posted by gbrtng

92s and newer have traction control and I think the bleeding procedure
is different than for the earlier non-TC vehicles. Or it may have to do with a different ABS modulator - somebody with a 92 or newer please jump in.

TC (ASR) is a throttle-based system only, so I don't think that's involved here... Though i seem to recall something about a change in bleeding procedure, now that you mention it -- but I don't know what year the change was made.

jcruz · 09-06-2011

Quote:

Originally Posted by VetteMed

TC (ASR) is a throttle-based system only, so I don't think that's involved here... Though i seem to recall something about a change in bleeding procedure, now that you mention it -- but I don't know what year the change was made.

I'll take a look at the bleeding procedure....

09-05-2011	#1
jcruz Join Date: Mar 2010 Location: Fort Myers, FL Posts: 343	Brake Puzzler I just got done swapping out the front brake pads on my 92 and I've run into a situation I never encountered before: Every time, after bleeding the RR and the LR, the pedal would be nice and stiff. Then, I'd jump over to the RF and the pedal would go soft again. WTH? Obviously, some air is getting back into the lines. Could it possibly be the bleeder screw needs to be replaced? Any other ideas? Thanks, John __________________ 1992 #043, Aqua/Gray 40k miles

09-05-2011	#2
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,828	Re: Brake Puzzler I've had similar difficulty from running the master dry and sucking some air in... I've bled the master in those cases and it seemed to help. __________________ 2004 Z06/Z16 LeMans Commemorative Edition 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold)