Summary of the brake system
S40/V40 features a diagonally divided brake system with disc brakes on all 4 wheels.
- The master cylinder's primary section supplies the left front and right rear.
- The master cylinder's secondary section supplies the right front and left rear.
Bosch 5.3 ABS with EBD is standard on S40/V40.
It is a closed system, since there is no return line from the ABS-unit back to brake fluid reservoir.
The system's electronic and hydraulic parts are integrated into one unit. However, service can be performed separately on them.
It is an extremely compact and reliable installation. There is no longer any cabling between the two parts. The whole unit is installed on the right side of the fender liner in the engine compartment, in front of the strut.
Due to the diagonally divided system, the hydraulic modulator has an output for each wheel.
The ABS brake system has a conventional tandem master cylinder with vacuum-assisted power brakes.
The brake fluid reservoir is installed on the brake's master cylinder and contains a float to indicate the fluid level. Level warning is generated if the fluid level is lower than the min. marking.