Chuffing noise from rear end. Park brake?
- Thread starter JetJock
- Start date
Custom exotics
Well-known user
You sure the handbrake shoes have just not been over adjusted and catching the disc/drum causing it to heat when driven hard and expanded making it worse ? Did you check to see if either rear wheel/disc felt hotter than other after driving ? I would jack back end up and try spinning wheels up by hand to see if you can feel the handbrake dragging
Yes, done that. I find it quite difficult to adjust the handbrake so that it's free, but grabs when need be - it is tested annually in the UK, or I'd be happy for it to be loose. I think it's probably a warped drum / shoes, so I'll likely end up getting replacement drum units entirely.
I did wonder if anybody would suggest it might be something more critical like in the driveline, which would be a lot more expensive if it lets go. I know the diffs on the 2005 are a little fragile.
Thank you for your response.
teamzr1
Supporting vendor
As with C5 and assume also for C6s ?
GM says to adjust the parking brake is to grab the parking brake handle, while holding the latch button down
and quickly jack the handle down and up sharply
several times, and that causes the parking brake adjuster to tighten up the parking brake pad.
GM says to adjust the parking brake is to grab the parking brake handle, while holding the latch button down
and quickly jack the handle down and up sharply
several times, and that causes the parking brake adjuster to tighten up the parking brake pad.
Thanks for your input, teamzr1
But my reading previously has indicated that the action you suggest only tightens up the cable to the brake units, but does not actually move the adjuster on the brake shoes.
Either way, if the park brake pads are too tightly adjusted, would the handbrake applications loosen them off again? I was under the impression that, if this action actually works on the brake pads themselves, it could only tighten them appropriately, and perhaps not loosen them...
I have previously tried that action, btw.
teamzr1
Supporting vendor
Have you not adjusted the brake shoe with the adjuster ?
I see this also from GM
Adjust the shoes, so there is a very slight drag on the drum when you reinstall it.
WARNING! If you get the drum too tight, you will NOT get it off again until the brake shoes wear down further!:
Adjuster wheel,
Park Brake Adjustment
Tools Required
J 21177-A Drum to Brake Shoe Clearance Gauge
Important
Park brake adjustment is not necessary after replacing the park brake lever or park brake cables.
The park brake cables are tensioned automatically by cycling the park brake lever three times.
Important
Do not operate the park brake lever with the rear disc brake rotor removed.
Place the inside measurement contacts of the J 21177-A at the widest point of the drum portion of the brake rotor (1).
Tighten the set screw on the tool in order to ensure the proper measurement when removing the tool from the drum.
Position the outside measurement contacts of the J 21177-A over the park brake shoe (1) at the widest point.
Important
If the gap between the adjuster nut and the adjuster screw exceeds 5 mm (0.25 in) during the adjustment procedure, the park brake shoe must be replaced.
Adjust the park brake shoe-to-drum clearance by rotating the adjustment nut on the park brake actuator. Specification
0.38 mm (0.015 in)
Install the rear brake rotors. Refer to Brake Rotor Replacement - Rear in Disc Brakes.
Install the rear tire and wheel assemblies.
Apply and release the park brake lever three times .
Apply the park brake lever. Inspect the rotation of the rear wheels:
The wheels should not rotate forward.
The wheels should drag or not rotate rearward.
If the rear tire and wheel assemblies rotate forward or do not exhibit drag rearward, repeat the adjustment procedure.
Release the parking lever. Verify that the wheels rotate freely
Lower the vehicle
Now that the Emergency Brake has been adjusted, test for tension (grab of the brakes shoes on the rotor).
If there is no tension, then the issue may just be the following problem in the brake handle assembly.
Take out the passenger seat and the rear portion of the center console to expose the Emergency Brake handle assembly.
Lubricate all areas near the lever and check for correct movement of the brake lever and ratchet system, mine was rusty and working intermittently.
Reassemble and test, mine will now lock up the rear tires with a medium tug.
I can now pass inspection and drift with confidence.......the Emergency Brake WORKS !
I see this also from GM
Adjust the shoes, so there is a very slight drag on the drum when you reinstall it.
WARNING! If you get the drum too tight, you will NOT get it off again until the brake shoes wear down further!:
Adjuster wheel,
Park Brake Adjustment
Tools Required
J 21177-A Drum to Brake Shoe Clearance Gauge
Important
Park brake adjustment is not necessary after replacing the park brake lever or park brake cables.
The park brake cables are tensioned automatically by cycling the park brake lever three times.
Important
Do not operate the park brake lever with the rear disc brake rotor removed.
Place the inside measurement contacts of the J 21177-A at the widest point of the drum portion of the brake rotor (1).
Tighten the set screw on the tool in order to ensure the proper measurement when removing the tool from the drum.
Position the outside measurement contacts of the J 21177-A over the park brake shoe (1) at the widest point.
Important
If the gap between the adjuster nut and the adjuster screw exceeds 5 mm (0.25 in) during the adjustment procedure, the park brake shoe must be replaced.
Adjust the park brake shoe-to-drum clearance by rotating the adjustment nut on the park brake actuator. Specification
0.38 mm (0.015 in)
Install the rear brake rotors. Refer to Brake Rotor Replacement - Rear in Disc Brakes.
Install the rear tire and wheel assemblies.
Apply and release the park brake lever three times .
Apply the park brake lever. Inspect the rotation of the rear wheels:
The wheels should not rotate forward.
The wheels should drag or not rotate rearward.
If the rear tire and wheel assemblies rotate forward or do not exhibit drag rearward, repeat the adjustment procedure.
Release the parking lever. Verify that the wheels rotate freely
Lower the vehicle
Now that the Emergency Brake has been adjusted, test for tension (grab of the brakes shoes on the rotor).
If there is no tension, then the issue may just be the following problem in the brake handle assembly.
Take out the passenger seat and the rear portion of the center console to expose the Emergency Brake handle assembly.
Lubricate all areas near the lever and check for correct movement of the brake lever and ratchet system, mine was rusty and working intermittently.
Reassemble and test, mine will now lock up the rear tires with a medium tug.
I can now pass inspection and drift with confidence.......the Emergency Brake WORKS !