C15A brakes jamming

[Phil Waterman]

Hi Harry

Assume that your problem is with the rear wheels?

First my HUP has almost always had a rear brake grab when the brakes are first applied after the truck has been sitting for any length of time. Now if I remember once I pull the truck out of the garage I stab the brakes a couple of times and the problem goes away, suspected cause light rust on brake drums from sitting that cleans right off.

Your problems as other have suggested sounds like miss-adjustment, cylinder sticking in the bore, failure of the brake pressure to release, or two other causes not mention yet.

Weak or wrong length brake springs
Parking Brake, is your parking brake on the drive shaft or on the wheels?

As other have suggested very careful brake adjustment by the book is probably the best approach. Suggest that you block the truck up so all the wheels are free to turn then back all of the adjustments off both top and bottom adjusters and start fresh at each wheel.

You comment or question about something simple like brake linings being to thick would indicate to that the linings are new or really good condition, correct?

One last point, many years ago I had all my cylinders wheel and master sleeved this has ended problems with the cylinders. Now it is replace the rubber parts every 10 years on principle.

Keep us posted on what you find.

Cheers Phil