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Thread: Brake help
07-08-2009, 06:14 AM #1
Well,I'm going to try typing this without writing a novel.
While I'm driving,there is a squealing noise & it goes away when I apply the brakes.It is coming from my drivers side.If I slowly apply the brakes,as I come to a stop the ABS kicks in & pulls my wheel to the left.If I push my brake pedal quickly,it stops normally.When I jacked my truck up to check the brakes,I spun my tire & there is a lot of friction going on there
What I've ruled out:
1. I do not have a brake fluid leak
2. I have plenty of brake fluid
3.I have plenty of brake pad left
I'm thinking I should start with bleeding my drivers side brake caliper
Has this happened with anyone here?My truck - 2006 Chevy Silverado 1500 4.3L V6
My toy - 2004 Yamaha Raptor 660R "673 cc's of fun!"
07-08-2009, 07:29 AM #2
Sounds like you have a wheel speed sensor acting up. Any debris or a loose wheel bearing can cause the sensor to act up. The ABS will respond to this and start pulsing your brakes.Jim
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07-08-2009, 09:27 AM #3
The caliper may not be sliding freely on its mount, or you could have a stuck piston.
Pull the wheel off and watch while someone step on the peddle.
While your there spray the caliper assembly with some brake cleaner.
If the caliper looks like its moving properly, you may have to rebuild/replace the caliper.
Some calipers have inspection holes in the caliper body. If they do not, the brake pads can be visually inspected from the outer ends of the caliper.
On a floating caliper, examine the mounting pins for rust that could limit travel. Most manufacturers recommend that these pins and their bushings be replaced each time the caliper is removed.
On a fixed caliper, check the pistons for sticking and rebuild the caliper if this problem is found.
Some sliding calipers use a support key to locate and support the caliper in the anchor plate.
A sliding caliper with suport plates (keys). The caliper support key is inserted between the caliper and the anchor plate. A worn support key may cause tapered brake pad wear. Always inspect the support keys when replacing brake pads.There is no way to happiness....happiness is the way.:yipi:
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07-09-2009, 06:19 PM #4
Well,I bled the brakes yesterday & that obviously wasn't the prob,so this weekend I am going to look into getting a rebuild kit for the caliper & check out the wheel bearing as well.
07-10-2009, 12:43 AM #5
If whatever it is is effecting the ABS they should pulse, that would be a sign that either the wheeel is "wobbling" or the speed sensor is reading incorrectly. You do not have over siized tires do you??? The key to me is the amount of friction you have when the truck was jacked up, that must be the problem. Any chance of a bad rotor or some damage?The diference between stupidity and genius is that genius has limits.
2007 NBS Silverado
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07-10-2009, 07:56 AM #6
I have the stock size 17" tires on it.This is something that just started a couple weeks ago.I am going to order a new caliper for it since they do not make rebuild kits yet.
07-16-2009, 06:47 PM #7
Doess anyone have a diagram of this speed sensor just in case this problem continues after I change my caliper?And how do I clean it?
07-16-2009, 09:02 PM #8
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Hope this helps a little.
Removal & Installation
- Raise and safely support the vehicle.
- Remove the wheel assembly.
- Remove the brake rotor.
- Remove the Wheel Speed Sensor (WSS) cable clip from the knuckle.
- Remove the WSS cable clip from the upper control arm.
- Remove the WSS cable clip from the frame.
- Remove the WSS cable electrical connector.
- Remove the WSS mounting bolt. CAUTION
Carefully remove the sensor by pulling it straight out of the bore. DO NOT use a screwdriver, or other device to pry the sensor out of the bore. Prying will cause the sensor body to break off in the bore.
- Remove the WSS from the hub/bearing assembly.
- Seal the WSS bore to prevent dirt or debris from falling into the hub.
- Clean the mounting surface on the hub to remove any rust or corrosion.
- Apply wheel bearing lubricant, GM P/N 01051344 or equivalent to the hub surface and the sensor O-ring to ease sensor installation.
- Install the WSS into the hub/bearing assembly.
- WSS sensor must be seated flat against the hub.
- Install the WSS mounting bolt.
- Tighten to 13 ft lbs (18 Nm).
- Install the WSS cable mounting clips.
- Connect the WSS cable electrical connector.
- Install the brake rotor.
- Install the wheel and tire assembly.
- Perform a low speed test for proper operation:
- Start the engine and allow it to idle.
- Verify the ABS indicator or the traction assist indicator remains illuminated.
- If the ABS indicator or the traction assist indicator remains illuminated, DO NOT proceed to drive the vehicle until it is diagnosed and repaired. Check the wheel speed sensor electrical connector to ensure it is not damaged and is installed properly. If the lamp remains illuminated, diagnostics are required.
- Select a smooth, dry, clean, and level road or large lot that is as free of traffic and obstacles as possible.
- Drive the vehicle and maintain a speed of at least 16 km/h (10 mph) for at least 5 seconds.
- Stop the vehicle and check to see if the ABS indicator or the traction assist indicator is illuminated.
- If an indicator is illuminated, diagnostics are required.
The powertrain control module (PCM) uses the transmission mounted vehicle speed sensor (VSS) for rear wheel speed input signals. The PCM then sends this information to the EBCM to use for ABS control.BRYAN
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