mackr1989 Posted January 19, 2019 Share Posted January 19, 2019 whenever i have to firmly and quickly use my brakes, i hear a loud thud sound and my truck pulls hard to the left. my mechanic cant find the issue. could this just be a bad brake chamber? Quote Link to comment https://www.bigmacktrucks.com/topic/55350-thud-and-turning-while-braking/ Share on other sites More sharing options...
BGarofalo Posted January 19, 2019 Share Posted January 19, 2019 I get this complaint all the time at the shop. Typically seized anchor pins are the culprit. Anything that is putting resistance on the brake shoe from freely moving can cause this issue. In my experience rarely is the brake chamber at fault for this complaint. Back off the slack, remove the drum and remove the main spring. Try to swing the shoes over center. The shoes should swing smoothly with little resistance and the anchor pins should rotate in the bushings. Even though brake shoe kits come with new anchor pins/bushings seems like most shops just throw them in the scrap pile cause they don’t want to spend the time to replace them. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/55350-thud-and-turning-while-braking/#findComment-413602 Share on other sites More sharing options...
JoeH Posted January 19, 2019 Share Posted January 19, 2019 I have several seized anchor pins on my trucks, never get this. When I drive other people's trucks I do sometimes. Adjusting the "self" adjusting slack adjusters takes it away for me... Quote Link to comment https://www.bigmacktrucks.com/topic/55350-thud-and-turning-while-braking/#findComment-413636 Share on other sites More sharing options...
Swishy Posted January 19, 2019 Share Posted January 19, 2019 guessn the oposite wheel to the way it pulls the steerin the 'S' cam has gorn over center Loud thud from go n ovr center pull n hard left from the brake released as the brake goes to nill adjustment on th@ wheel ifn u get my drift cya 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55350-thud-and-turning-while-braking/#findComment-413638 Share on other sites More sharing options...
JoeH Posted January 20, 2019 Share Posted January 20, 2019 16 hours ago, Swishy said: guessn the oposite wheel to the way it pulls the steerin the 'S' cam has gorn over center Loud thud from go n ovr center pull n hard left from the brake released as the brake goes to nill adjustment on th@ wheel ifn u get my drift cya As swishy said, "self" adjuster gets so far out that S cam goes over center, effectively releasing that brake, giving you unsynchronized brakes. This is why i always liked manual adjusters, you gotta get out and set them, and the truck will stop straight every time. Added bonus is while youre in there you gotta look at things like brake linings, air hoses, springs, youll hear if a maxi is leaking, etc. Downside is if you hire incompetent people that won't check them then they'll rear end someone at some point. Quote Link to comment https://www.bigmacktrucks.com/topic/55350-thud-and-turning-while-braking/#findComment-413692 Share on other sites More sharing options...
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