Weird Brakes...

89fc3s · 08-25-2010, 08:48 PM

89 GTU w/ TII front calipers.

They grab decently hard but when i press the pedal there is no feedback (supersoft pedal)

other times i can push them as hard as i can and the car will barely stop.

Any suggestions??
Any questions??

lt1_fd3s · 08-25-2010, 09:28 PM

you swapped out the master cylinder and booster, didn't you?

josh18_2k · 08-25-2010, 11:06 PM

i had all sorts of weird problems with a bad booster before. try swapping another one on

***TitaniumTT*** · 08-26-2010, 08:40 AM

The problems with bad boosters, or bad booster lines if you have a turbo, is that they can be intermitant. So, as was already said, swap it out with a known good one and see if the problem goes away. Be advised though, there is a difference in size between the 4/5 lug and the turbo line has a one way valve in it.

89fc3s · 08-26-2010, 06:25 PM

i swapped the one that was on the car that just caused weak brakes w/ an s4 booster that was still "good" made the brakes better but nowhere near the way they should be.

so its narrowed down to booster?? booster and master cylinder?? it could it be a leak in the line that powers the booster? Just clarifying

Nismo · 08-26-2010, 08:03 PM

It could be that you have to adjust the rod that goes into the booster.

***TitaniumTT*** · 08-26-2010, 09:09 PM

Adjusting that rod wouldn't correct an intermitant problem. It's something else.

Swap the booster to a known good one so it can be crossed off the list. Then it's down to Master (which I don't think it is) or a bad one way valve.

Are we talking a turbo car here?

89fc3s · 08-26-2010, 11:54 PM

n/a car TII calipers

Nismo · 08-27-2010, 05:41 PM

Quote:

Originally Posted by TitaniumTT

Adjusting that rod wouldn't correct an intermitant problem. It's something else.

Actually it will, I had this issue after I swapped in my 929 booster and master, it would intermittently drag and cause the brakes fade like a mofo, I adjusted it so it was shorter and I no longer have an issue with brake fade.

08-25-2010, 08:48 PM	#1
89fc3s rotary powaaa Join Date: Jun 2008 Location: Charlotte NC Posts: 47 Rep Power: 0	Weird Brakes... 89 GTU w/ TII front calipers. They grab decently hard but when i press the pedal there is no feedback (supersoft pedal) other times i can push them as hard as i can and the car will barely stop. Any suggestions?? Any questions??

08-25-2010, 09:28 PM	#2
lt1_fd3s WNC Tour Guide Join Date: Feb 2008 Location: WNC Posts: 780 Rep Power: 18	you swapped out the master cylinder and booster, didn't you? __________________ WNC Tour Guide - Including the Tail of the Dragon - PM for details

08-25-2010, 11:06 PM	#3
josh18_2k Rotary Fanatic Join Date: Feb 2008 Location: Gresham, OR Posts: 473 Rep Power: 18	i had all sorts of weird problems with a bad booster before. try swapping another one on __________________

08-26-2010, 08:40 AM	#4
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son Posts: 4,581 Rep Power: 10	The problems with bad boosters, or bad booster lines if you have a turbo, is that they can be intermitant. So, as was already said, swap it out with a known good one and see if the problem goes away. Be advised though, there is a difference in size between the 4/5 lug and the turbo line has a one way valve in it. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

08-26-2010, 08:03 PM	#6
Nismo 400WHP or bust Join Date: Mar 2008 Location: Kincardine, Ontario Canada Posts: 165 Rep Power: 18	It could be that you have to adjust the rod that goes into the booster. __________________ 1986 GXL- Being built with a 13B RE... http://www.rotarycarclub.com/rotary_...ead.php?t=9602 1986 Base-RB Exhaust, HKS filter, Solid Aluminum motor mounts, S5 TII motor, ACT Clutch, HKS SSQV, Light Weight Flywheel, Haltech E6X, 720cc 2ndaries, Koni Yellows, Tein Springs Koyo Rad, 250 WHP 230 FTLBS Stock turbo, and stock IC at 10psi. RIP!! The daily bitch- 1995.5 Toyota Tacoma- Trueflow airfilter, and Bilstein HD shocks. 2009 Toyota Corolla "S" TRD Filter... 40MPG

08-26-2010, 06:25 PM	#5
89fc3s rotary powaaa Join Date: Jun 2008 Location: Charlotte NC Posts: 47 Rep Power: 0	i swapped the one that was on the car that just caused weak brakes w/ an s4 booster that was still "good" made the brakes better but nowhere near the way they should be. so its narrowed down to booster?? booster and master cylinder?? it could it be a leak in the line that powers the booster? Just clarifying

08-26-2010, 09:09 PM	#7
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son Posts: 4,581 Rep Power: 10	Adjusting that rod wouldn't correct an intermitant problem. It's something else. Swap the booster to a known good one so it can be crossed off the list. Then it's down to Master (which I don't think it is) or a bad one way valve. Are we talking a turbo car here? __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

08-26-2010, 11:54 PM	#8
89fc3s rotary powaaa Join Date: Jun 2008 Location: Charlotte NC Posts: 47 Rep Power: 0	n/a car TII calipers