Re: clunk in right front brake 1201
Posted by Owen_Dyneto On 2015/8/12 10:04:03
With the parking brake on when I rotate the wheel is feels as if the shoes are rocking with the drum
No reason to feel intimidated by the Bendix mechanical brakes, nothing counterintuitive.
Just for starters if you can rotate the wheel with the parking brake applied the shoes are way out of adjustment as the parking brake actuates all 4 wheel brakes. I'd pull the drums to make sure everything is reassembled correctly and lubricated; consider removing the cable sheaths and lubing the cables internally with a good graphite grease such as Sta-Lube SL 3303 if they haven't been done in recent memory. Then with the cables dropped do a thorough major brake adjustment per the Service Letter; don't ignore the eccentric adjustment - always a requirement when new shoes have been installed. Then reattach the cables, lengthening or shortening if necessary such that the clevis pin just enters the actuating levers. It's all in the Service Letters in good detail.
Then perhaps do a road test, its a pretty primitive test, preferably on dirt or gravel so you can "read" the wheel drag on each wheel and make further adjustments. Remember, the left front wheel has narrower linings to compensate for the trunnion block so on light pedal pressure a very slight pull to the right would be expected but not on a heavy brake application. I trust the guy who relined your front brakes was aware of the different lining widths front left and right.
However an alternative I use to get a very close static adjustment is with the cables dropped and the small "window" removed from the drum so you can use a feeler gauge between the shoes and the drum and adjust according to the service letters. Then adjust the lengths and attach the cables and use a jack or similar and apply partial pressure to the brake pedal - then go around and check each wheel individually and adjust at the wheel until you have uniform drag at each wheel. Crank the pedal down a bit tighter and readjust if necessary.
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No reason to feel intimidated by the Bendix mechanical brakes, nothing counterintuitive.
Just for starters if you can rotate the wheel with the parking brake applied the shoes are way out of adjustment as the parking brake actuates all 4 wheel brakes. I'd pull the drums to make sure everything is reassembled correctly and lubricated; consider removing the cable sheaths and lubing the cables internally with a good graphite grease such as Sta-Lube SL 3303 if they haven't been done in recent memory. Then with the cables dropped do a thorough major brake adjustment per the Service Letter; don't ignore the eccentric adjustment - always a requirement when new shoes have been installed. Then reattach the cables, lengthening or shortening if necessary such that the clevis pin just enters the actuating levers. It's all in the Service Letters in good detail.
Then perhaps do a road test, its a pretty primitive test, preferably on dirt or gravel so you can "read" the wheel drag on each wheel and make further adjustments. Remember, the left front wheel has narrower linings to compensate for the trunnion block so on light pedal pressure a very slight pull to the right would be expected but not on a heavy brake application. I trust the guy who relined your front brakes was aware of the different lining widths front left and right.
However an alternative I use to get a very close static adjustment is with the cables dropped and the small "window" removed from the drum so you can use a feeler gauge between the shoes and the drum and adjust according to the service letters. Then adjust the lengths and attach the cables and use a jack or similar and apply partial pressure to the brake pedal - then go around and check each wheel individually and adjust at the wheel until you have uniform drag at each wheel. Crank the pedal down a bit tighter and readjust if necessary.
Attach file:
(191.18 KB)
(248.44 KB)
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