Check the LPV (Load proportioning valve), if fitted. It controls the amount of rear vs front braking under "heavy" loads, if faulty it will cause rear lock up.
Another thing to check is that front brakes have been bled, and the front brake circuit is working at all.
If the rear wheel brakes are locking up on a vehicle they should be thoroughly checked. The master cylinder may need to be replaced on the car.
Camry 98 has drum based rear brakes.
the sensor is under the exhaust manifold at the rear of the engine
Disc brakes in the front, drum brakes in the rear. Anti-lock brakes were optional.
If drum brakes you probably have a bad wheel cylinder on the side that is locking up.
There are none.
The rear brakes will lock when there isn't enough weight in the rear of the vehicle, the surface is loose (like a gravel road), or they [the brakes] are applied to heavily. Newer vehicles with anti-lock brake systems (ABS) should not have this problem.
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How do I change the Front Brakes on a 2001 Toyota Corolla?
Is it drum brakes? It's time for an inspection unless you just wanna replace the rear brakes yourself.
The 1985 Toyota Tercel brakes are equipped with an adjustment bolt. Turn the adjustment bolt to raise or lower the brake shoe.