My 2002 SL 2 has 112,000 miles and for the first few touches on the brake petal the rear brakes will sometimes lock up ( they do not both necessarily lock up at he same time). There is also a slight metallic clunking sound. Once a mile or so down the road no noise and no lock up problems. Have had 2 shops look for the problem. No hang ups or problems seen. The shoes have some wear but arte not close to needing to be replaced. This problem put me in the ditch at 20 mph and cost $1600.00 in damage to the car!
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On most cars the adjustments to rear brake shoes are done automatically using the parking brake. Once you install your drum, pull the parking brake lever up sveral times, there is a mechanism that rachets up the brake adjuster. You would have seen these if you took the shoes off to install the new cylinder. You have to do that until the parking brake can just pull the lever up in to locking position.
there is a brake regulator on modern systems which controls the power between the front and the back breaks this maybe defective
when a car breaks most of the breaking force is placed on the front breaks as that is where most of the energy is heading so the car sinks down. if the same amount of breaking force is placed on the back wheels as they rise they have less friction as the weight is forward so they will lock up. the device is designed to maintain more force to the front, if it fails the system will apply even force to all wheels.
recommend cosulting a certifed garage or local dealership about this problem. Warning; continual driving with defctive breaks is illegal and may result in injury or loss.
Take it back to the dealer who fixed it.
Driving with the rear brakes locked may have warped the rotors. Blue color is from excessive heat. Sounds like a preportioning valve in the brake system is faulty.
The dealer didn't do his job very well. Find another dealer.
Most of the time with the rear brakes locking up the brake drums are warpped. If you remove the rear brake drums and take them to almost any auto parts store (Napa, Checkers ect.) they will turn the drums for about $10 a piece.
After you have the drums turned you will need to readjust the rear brakes.