|
|
|
|
Thread Tools | Display Modes |
12-22-2012, 12:18 PM | #1 |
Scooby Newbie
Member#: 330431
Join Date: Aug 2012
Vehicle:2005 STI PSM |
New brakes gone bad
Just had new brakes and rotors put on the Sti a month or two ago, did a lot of heavy breaking a few days ago, one because of idiots in traffic, etc. once I was home I could smell my brakes, also noticed them get extremely squishy on my way back. Now, three days after, the stopping power is minimal, doesn't feel strong. What happened?
* Registered users of the site do not see these ads.
|
12-22-2012, 12:34 PM | #2 |
Scooby Specialist
Member#: 242205
Join Date: Mar 2010
Location: Dallas
Vehicle:2009 I don't know Dirt |
What kind of pads?
|
12-22-2012, 05:16 PM | #3 |
Newbie Moderator
Moderator Member#: 91347
Join Date: Jul 2005
Chapter/Region:
NESIC
Location: Boston, MA
Vehicle:2004 Tacoma Crew Cab 2012 Triumph 1050 |
|
12-22-2012, 09:51 PM | #4 |
Scooby Newbie
Member#: 336204
Join Date: Oct 2012
Location: London, Ontario Canada.
Vehicle:1979 Z28 Camaro Burgundy |
Like Loyale said we'd need more information, could have gotten seized and just burned the brakes out, not bled, brake booster. Plenty of problems that could be caused and have these symptoms. Sorry for the pointless post just trying to help you .
|
12-22-2012, 10:24 PM | #5 |
Scooby Newbie
Member#: 329715
Join Date: Aug 2012
Chapter/Region:
South East
Location: NC
Vehicle:2012 WRX 2015 WRX |
Yeah, more info would be nice. What color is your brake fluid? If its bad, and when you pressed the pistons back in, you may have pushed up the contaminated fluid and messed up the master cylinder. That's the worst case scenario. I'd bleed the brakes if they feel spongy or dark in color. Check the color of the rotors too, you may have burned them up pretty bad and my just need resurfacing. Pads may be gone too, but just need more info. Hope this kind of helps.
|
12-23-2012, 09:05 AM | #6 |
Scooby Specialist
Member#: 287534
Join Date: Jul 2011
|
Worst case scenario would be pushing the pistons back without cracking the bleeder screws, and forcing the brake fluid back too quickly through the ABS unit, which can damage one-way valves inside in the unit. During the "heavy braking" in traffic (too much speed in traffic wouldn't play a part in that, would it? ) the ABS may have activated, and now you have air in the system that is going to required secondary air bleeding to get out.
|
12-23-2012, 10:28 AM | #7 |
Scooby Newbie
Member#: 324527
Join Date: Jun 2012
Location: Memphis TN
Vehicle:2013 wrx white |
If he is getting air in system because his abs activated it would have been soft peddle long before this one incident, they don't just randomly introduce air into the system when activated. Highly unlikely something is damaged from pushing piston back in without opening bleeder. Like they said possible seized caliper, booster, a brake line collapsing inside, leaking mc.
|
12-23-2012, 11:15 AM | #8 | |
Scooby Guru
Member#: 139955
Join Date: Feb 2007
Chapter/Region:
NESIC
Location: Boston
Vehicle:2015 Subaru STI 17Forester / 18Crosstrek |
Quote:
Many pad changes, many track days, many bleeds. Not one issue. |
|
12-23-2012, 12:43 PM | #9 |
Scooby Guru
Member#: 60082
Join Date: Apr 2004
Chapter/Region:
MWSOC
Location: Minnesota
Vehicle:2004 Forester STI Silver |
Placebo effect?
I would doubt what little you can do in traffic can harm the car. You just can't generate the heat necessary to do anything. The STI rotor size is pretty substantial and can absorb a lot of heat. You would have to be doing track days on sticky tires to do enough. The only problem I can see is you buying super, super cheap pads, and they are simply junk. If you skimped out on pads by buying the cheapest junk you could find, then they could have problems with fading during heavy use and potentially glaze some and reduce friction for a period of time. However, your first comments should have been something about your brakes fading in traffic, not my brakes feel weeker days later. You said nothing about fade, so I suspect they never really overheated. In this case, your brakes are what they are, and I would think it's more of a placebo effect than anything else. Maybe they just have a lower friction coefficient than the old ones and your use seems off because they don't bite as hard as you'd expect. Pad friction can also be affected by temp and water. |
12-23-2012, 12:47 PM | #10 |
Scooby Specialist
Member#: 118500
Join Date: Jun 2006
Chapter/Region:
MWSOC
Location: Michigan
Vehicle:02 Silver Wagon "Stage 2" |
Did you do a bed in procedure?
|
Thread Tools | |
Display Modes | |
|
|