Brakes-no cure-'03 F150XLT 8' box
05-19-2013, 01:41 PM
#1
Junior Member
Thread Starter
Brakes-no cure-'03 F150XLT 8' box
After having a new driveshaft installed, my truck now has an intermittent rap-rap sound like a piece of chain spinning of a wheel and hitting against the frame. The repair shop has examined underbody and the following steps were taken and more road tests:
1. Brakes examined, new driveshaft inspected.
2. Emergency brakes unhooked.
3. Emergency brakes completed removed.
4. New rotors & pads.
5. Rear differential opened up for signs of irregularities.
6. Rear calipers removed.
**This eliminated the sound.**
7. Rear calipers re-installed one at a time and sound isolated to right rear.
8. Right rear caliper removed to eliminate sound.
9. New caliper installed on right rear and the sound returned.
10 Mechanic cannot find anything-anything. New caliper removed and returned for credit.
1. Brakes examined, new driveshaft inspected.
2. Emergency brakes unhooked.
3. Emergency brakes completed removed.
4. New rotors & pads.
5. Rear differential opened up for signs of irregularities.
6. Rear calipers removed.
**This eliminated the sound.**
7. Rear calipers re-installed one at a time and sound isolated to right rear.
8. Right rear caliper removed to eliminate sound.
9. New caliper installed on right rear and the sound returned.
10 Mechanic cannot find anything-anything. New caliper removed and returned for credit.
05-19-2013, 02:24 PM
#2
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Join Date: Apr 2013
Location: near Portland Oregon
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Check right rear backing plate and inside of right rear wheel for signs of contact. Also check right rear axle end play. Finally check for loose (rear) transmission cross member and transmission mount bolts.
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gjdehaan (05-23-2013)
05-21-2013, 01:14 PM
#3
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Thread Starter
I called shop, they will make these inspections; he said its possible someone in the shop did some of these. Any other ideas? How could a caliper be removed to eliminate the noise and a brand new caliper also makes it happen? Most of the time brakes must be lightly applied to cause it, but noise will occur "on its own" too.
Last edited by gjdehaan; 05-21-2013 at 01:17 PM. Reason: more data
05-21-2013, 04:35 PM
#4
Senior Member
has the inside of the rim been checked for drag marks? slight bend in the rim hitting the caliper? It doesn't take much. Also the little e-brake shoes inside the rotor may be an issue. Just a thought
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gjdehaan (05-23-2013)
05-22-2013, 04:15 PM
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Inner and outer disc brake pads are slid into place onto 2 sheet metal brackets that serve 2 functions as guides & retainers. New or used, these need a small dab of grease to allow the pads to move freely with the floating caliper. Disc Brake "Quiet" is available in spray-on or liquid and should be applied to the back of the brake pads before installation. When the caliper is refitted, the pads will adhere to the caliper pistons and outer caliper dogs when the caliper pistons are pressed against the rotor as the brake pedal is applied, and any noise coming from the new brake pads should be eliminated after the application of this adhesive.
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gjdehaan (05-23-2013)
05-30-2013, 04:43 AM
#7
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Thread Starter
Found the cure
Another transmission shop was brought in. When the new driveshaft was installed, the carrier bearing was installed backwards. They also thought the "Pinion" was too tight.(?).