DIY mot/nct pre checks - Brakes

[james]

MOT Test of Brakes

Test Description

Brake efficiency and balace is usually checked on a roller brake tester. In certain cases where a roller brake tester may not be used (for example on certain 4-wheel drive vehicles) it may be necessary to check brake efficiency and balance on a road test, with a portable decelerometer.

Inside the car

Anti-lock braking system (if fitted) warning lamp is checked for:

function

sequence of operation

Footbrake

sufficient reserve travel on the footbrake

pedal rubber not worn to excess

correct operation of the servo assistance system

Parking brake

This could be hand, foot or electronically operated. Checked for reserve travel so that it doesn't reach the stops on application. The mountings will be checked for security and/or corrosion.

Under bonnet checks

master cylinder and servo unit are checked for leaks with the engine on and the brakes applied

servo unit will be checked to ensure it is operating correctly

visible metal or flexible brake pipes will be checked for corrosion, condition, fouling or leaks

Under vehicle checks

flexible brake pipes and any other metal brake pipes visible beneath the car are checked

discs and drums (external only) checked for condition and contamination

brake back plates and caliper securing devices are checked for condition and security

condition of the brake pads will be checked if visible

The assistant operates the handbrake and the condition of the linkages and/or cables is checked.

on some vehicles there will be a brake compensating valve beneath the car which will need to be inspected for fluid leaks

Brake performance check

The performance of the front and rear brakes and handbrake are checked for efficiency and balance using specialised equipment.