Re: Breaks not working properly
The master cylinder has a primary and secondary piston. The primary is for the front brakes and the secondary for the rear brakes. A failure of the secondary piston or seals could cause low brake pressure to the rear, eventhough changing the rear pads should not make any difference on the function. Jack up the rear and check if you can turn the rear wheels when pressing the brake pedal. They should stay fixed even when using a bar on one of the wheel nuts. If the wheel turns with ease, then there is a problem. The problem then could be the master cylinder, dirt in the master cylinder secondary piston inlet or a problem with the rear wheels ABS function. The front wheels have each their own channel for ABS function, but the rear wheel work in tandem and only have one channel for both, releasing both rear brakes when a rear wheel slip is detected. So a failure there would influence both rear brakes. There is no ABS fault light on the instrument panel?