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| | | | Joined: Apr 2008 Posts: 502 Shop Shark | | Shop Shark Joined: Apr 2008 Posts: 502 | Hey all,
I have a 49 3100 with huck brakes. On the front right brake when I hit the brakes it tends(not always) to start engaging, then lock up the wheel. but it kind of happens on its own, even when I start releasing the brake pedal. You can feel this start to happen sometimes, then it goes away. But sometimes it grabs completely locking the right front wheel up. Anyone care to ponder with me what causes this. all four cylinders have new Brake shoe return springs- Fluid level is correct. Wheel bearing torqued to 33 ft lbs, then the castle nut backed off 1/6th of a turn to fit the lock pin. The shoes have plenty of material on them and the are uniformly wearing. there is no debris or sand of any kind in the drum. the inner side of the drum where the shoes contact is clean and polished from the braking.
let me know if you need any more info. | | | | | Joined: Dec 2006 Posts: 206 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 206 | I had that problem on a 72 rear brake it turned out to be the new shoes. I replaced them and it worked fine after that. | | | | | Joined: Feb 2001 Posts: 1,096 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,096 | Yeah, I had a set of crappy shoes do that.
Another truck I worked on had defective flex brake hose. new hoses fixed its errant brake problems. | | | | | Joined: Dec 2003 Posts: 2,953 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 2,953 | Are the drums out of round. You say polished. Why not take some emery cloth and scuff them a bit? The other possibility as mentioned above, albeit slight, is a defective rubber brake hose. | | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | My first guess would be that you have a wheel cylinder sticking Sam. Did you rebuild the cylinders, I mean a good thorough rebuild?
Also shoes used to come with the leading edges tapered, now days they are all square. I always take a file and taper the leading edge back about 3/8" and about half the depth of the shoe thickness.
Denny Graham
Sandwich, IL
Denny G
Sandwich, IL
| | | | | Joined: Mar 2009 Posts: 208 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2009 Posts: 208 | I had that problem with the rear wheel in my 1998 F150. Would just lock up.
You may have more brake pressure going to that wheel than the other up front. Make sure you don't have any kinks or debris in the lines - a good flush of the brake system would be a start. | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | If the inside of the flex line is breaking down, it can act as a one way valve trapping the pressure in the wheel cylinder. That problem is fairly common when the hoses get old. | | |
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