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73-87 Chevy _ GMC Trucks => Brakes, Frame, Steering & Suspension => Brakes and Braking Systems => Topic started by: negron.victor.85c10 on August 06, 2015, 04:42:28 PM
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I recently installed CPP's Big Brake Kit with the front 13" rotors and the rear drum to 12" rotor disc conversion ..... Well everything hasn't gone as smooth as I hoped .... Besides the fact that I had to buy new, customize and re-route S/S hard lines in the engine bay the install wasn't bad. Master cylinder and lines have been bled front seems to be working fine but now I hear a grinding noise coming from rear. I removed the wheels made sure nothing was loose, axle play at minimum, I have removed some millage off the pads and beveled the edges, made sure my e-brake cable wasn't too tight. I'm running out of ideas ..... ??? has anyone used this kit with similar problems or have any ideas?
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I recently installed CPP's Big Brake Kit with the front 13" rotors and the rear drum to 12" rotor disc conversion ..... now I hear a grinding noise coming from rear....
Anytime the vehicle is moving? Only when braking? Only when turning a corner? Does it 'grind' with the vehicle safely supported on jack stands with both the rear wheels installed and then removed? Can you isolate the noise to one side? Is a wheel or wheel weight interfering with a caliper?
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This might sound stupid but check your rims to see if the caliper is not hitting or rubbing on it.
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yes it makes the noise when the truck is moving, worse when the brakes are applied gently and when turning a corner. I thinks its isolated to the passenger rear. No interference with the wheel and caliper
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Is the noise louder while turning because sound is reflecting off the curb? Any chance a caliper is dragging against the hub where you can't see it? How are the axle bearings?
Chock the front wheels and raise the back of the vehicle up on jack stands so the tires are safely suspended above the ground. Employ the assistance of a helper and start looking for any interference or rubbing. Use a 3' long 1" or 1.25" diameter rubber hose as a listening tube to help pinpoint the source of the noise if necessary. Work safe. Maintain a suitable distance from moving parts and run the vehicle in gear with the wheels on and off. Apply & release the park brake too while the axles are spinning to see if it has any effect on the noise. Is the park brake design in that kit internal shoe or pad apply?
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Yes the noise is louder when you turn but I don't think it's because its bouncing off of the curb... I jack the rear end up and rotated the wheels by hand I couldn't get it to make the noise I took the wheels back off rotated the rotor by hand couldn't see anywhere where it would be making contact I put the wheels back on turn the truck on shifted down to drive and let the wheel spin you could barely hear the noise but it was still making it
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Any change in the noise when applying the e-brake? Use a listening tube or mechanic's stethoscope to see if the noise is coming from an axle bearing. If the noise worsens in reverse it could also be a u-joint.
All that aside, how do the pads center across the face of the rotors? Do they overhang the outer diameter? Also, check that the caliper supports are square to the axle flanges and properly anchored to the axle tube with no gaps, and that the mounting bolts are properly seated and torqued. Any misalignment, looseness or flexing in the mounts might result in chatter.
Have you spoken with CPP?
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I am interested in that kit. Can you post pictures?
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I think we've narrowed it down to axle play .... when I rotate the wheel on the rear passenger side while applying slight pulling pressure we hear the rotor screeching against the pad every time ... I've read there are different size c-clip .. does anyone know more information about this ? I have a GM 10 bolt that previously has 28 spline axles but were replaced with 30 spline axles
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I'll post pics when I can
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Axle c-clips (aka, locks) are not unique to GM and many are interchangeable between manufacturers. Unless CPP provides specific information on acceptable axle end-play for their disc brake kits, I suspect that ideally it should be in the range of 0.010" - 0.030". But this is just a WAG and should be verified... if it's even attainable. Please post what you discover for the benefit of anyone else encountering this problem.
GM 3833322 = 0.150" thick (standard for truck 10-bolt & 12-bolt)
GM 3959067 = 0.155" thick
GM 3959068 = 0.160" thick
Dorman 81050 (http://www.dormanproducts.com/p-8622-81050.aspx?origin=keyword) axle shaft lock kit consists of one each, GM 3833322 & 3959067.
DiffsOnly.com (http://www.diffsonly.com/store/index.php?cPath=96_375) has a variety of axle c-clips. I'm sure there are many sources. Check with a local rebuilder.
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Do you know anything about c-clip eliminators? Will they eliminate axle play all together or at least to a minimum