bulldog man Posted January 29, 2006 Share Posted January 29, 2006 My B422T HAS AIR BRAKES BUT THE Parking brake was a hand brake this was long gone (since i was bout 6yrsold now pushing 31, gramps & dad kept a scoth block in truck to park with question is do i just change chambers out or redo the whole brake system ? Any help is gratefull yall have a safeone Bulldog Quote You Cant Fix Stupid. But You Can Numb It With A Sledgehammer. Link to comment https://www.bigmacktrucks.com/topic/762-question-yall-bout-converting-from-hand-parking-brake-to-spring-brakes/ Share on other sites More sharing options...
bulldog man Posted January 29, 2006 Author Share Posted January 29, 2006 sorry yall didnt see brake section maybe barry can carry this topic over there for me ? yall have a goodone bulldog Quote You Cant Fix Stupid. But You Can Numb It With A Sledgehammer. Link to comment https://www.bigmacktrucks.com/topic/762-question-yall-bout-converting-from-hand-parking-brake-to-spring-brakes/#findComment-3696 Share on other sites More sharing options...
rsmartyn Posted January 30, 2006 Share Posted January 30, 2006 Hi Guy, I did it years ago on my B61 single axle but I had it easy. The trucks got a big (40,000 lbs.) Eaton 2 speed rear so the spring set air release chambers fit no problem. I pulled the originals that I used off an old Great Dane trailer. With Mack rears it's trickier to see what chambers will fit. Installing a valve in the dash is easy, just find a good spot, run a supply line to it and then lines back to the release ports on the chambers. The service side of the chambers remains the same but finding one that'll fit your rear (or rears) might be tricky. Quote Ain't a Mack? Take it back! Link to comment https://www.bigmacktrucks.com/topic/762-question-yall-bout-converting-from-hand-parking-brake-to-spring-brakes/#findComment-3701 Share on other sites More sharing options...
truxnut Posted January 31, 2006 Share Posted January 31, 2006 If you have the small Mack piston style chambers the only out is to build some offset mounting adapters and get soem slacks with offset arms. Years ago you could buy those offset brackets and some hokey offsets for the slacks also. If you are lucky and have regular diaphram chambers now [fat chance probably] the spring pots should fit OK. Quote John Evans, Trucks & Dogs are expensive!! Link to comment https://www.bigmacktrucks.com/topic/762-question-yall-bout-converting-from-hand-parking-brake-to-spring-brakes/#findComment-3736 Share on other sites More sharing options...
bulldog man Posted January 31, 2006 Author Share Posted January 31, 2006 its a single axle tractor w/ 23 style chambers on the rear axle & steer axle as well if that helps yall & thanks for the replys yall keep em comin Thanks again & have a safe one Bulldog Quote You Cant Fix Stupid. But You Can Numb It With A Sledgehammer. Link to comment https://www.bigmacktrucks.com/topic/762-question-yall-bout-converting-from-hand-parking-brake-to-spring-brakes/#findComment-3749 Share on other sites More sharing options...
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