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Old 05-11-2010, 07:34 PM   #1 (permalink)
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Default Brakes = stage left

I got a Sierra that pulls left like crazy if I hit the brakes with any sort of conviction - how do I sort this out?

Simple solution or costly? Was hoping a new exhaust would be my next purchase, but this is kinda more important.
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Old 05-11-2010, 07:44 PM   #2 (permalink)
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does it do it in 2wd and in 4wd? or just 2wd? It could be a broken caliper or a worn shoe, or bad proportioning valve, or alignment could be off... You need to do some more diagnostic work before you can pinpoint the problem.
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Old 05-11-2010, 11:36 PM   #3 (permalink)
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also check the brake hoses
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Old 05-12-2010, 02:55 AM   #4 (permalink)
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Happens in all ranges. Not too bad if brakes are slowly applied, but if put the brake pedal to the floor it'll veer pretty hard. All brakes are working , it's just that the left front disc seems to grab the hardest.

Is this something I could fix myself, or best left to a professional?
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Old 05-12-2010, 07:27 AM   #5 (permalink)
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Quote:
Originally Posted by che_guitarra View Post
Happens in all ranges. Not too bad if brakes are slowly applied, but if put the brake pedal to the floor it'll veer pretty hard. All brakes are working , it's just that the left front disc seems to grab the hardest.

Is this something I could fix myself, or best left to a professional?
Contrary to your belief - all the brakes are NOT working - the right front has a problem, as evidenced by the fact that it veers left when you brake.

Re-examine that corner - check for binding caliper slides, stuck piston, partially blocked hose, etc.
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Old 05-12-2010, 08:58 AM   #6 (permalink)
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Contrary to your belief - all the brakes are NOT working - the right front has a problem, as evidenced by the fact that it veers left when you brake.

Re-examine that corner - check for binding caliper slides, stuck piston, partially blocked hose, etc.
not necessarily. it could be a problem with the front left: for example, could be getting more pressure from the brake lines compared to the other brakes, etc... yes it is unlikely, but i wouldnt rule anything out until proven otherwise...
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Old 05-12-2010, 11:41 AM   #7 (permalink)
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not necessarily. it could be a problem with the front left: for example, could be getting more pressure from the brake lines compared to the other brakes, etc... yes it is unlikely, but i wouldnt rule anything out until proven otherwise...
I don't want to take this too far off topic, but I'd love to hear your theory on how the left brake would be getting more pressure - less pressure is easy - but more pressure I'm all ears.
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Old 05-12-2010, 03:38 PM   #8 (permalink)
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It could be in the back. If one side isn't grabbing it would push that side harder and cause the vehicle to veer under heavy braking conditions. Damaged or malfunctioning proportioning valve could be sending more pressure to one side or the other. With the proportioning valve, Its not necessarily too much pressure or too little pressure as a difference of pressure being sent.

Like squid said, Check the soft lines. They can make an enourmous difference if they are old and worn. They won't be leaking or anything that obvious, but if they are worn out looking, replace them. They're cheap and easy.
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Old 05-12-2010, 09:48 PM   #9 (permalink)
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I had a vehicle that pulled hard and the rotor on the pulling side was contaminated with road tar substance. the pads would grab hard even with a light pedal pressure. pretty obiviously found during inspection but if i only look at non-pulling side I would have missed it. we don't have sierra here in the USA so I don't know but if these like our samurai with non-ABS brakes, you can do the old time skid test. drive on a open quite street at a moderate speed and press brake petal hard causing the wheels to skid. skid all the way to a stop then get out and look at the marks on the street. if there are only three marks, the wheel without a skid mark is where you start. if there a four marks but one of them starts skiding way before the other three (one skid mark is alot longer) start with that wheel and look for grabby brakes . if all for wheel have equal skids the I would start with a suspention/steering issue. this will not work with newer ABS brake systems.
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