![]() ![]() ![]() (e) External damage likely to affect the function of the braking system (d) Air leak causing a noticeable drop in pressure or audible air leak (c) Repeated operation of any ancillary air or vacuum system completely depletes the stored air or vacuum for the braking system (b) Time taken to build up air pressure/vacuum to safe working value not in accordance with the requirements (ii) two brake applications after warning device has operated (or gauge shows an unsafe reading) (i) four brake applications after the warning device has operated (or gauge shows an unsafe reading) (a) Insufficient pressure/vacuum assistance for less than: 10” to 12” (25 to 30cm) for a vacuum gauge.45psi (3.1kg/cm2 or 3 bar) for a pressure gauge.Pressure build-up is considered satisfactory if the warning device stops operating within:įor checks that require reference to a pressure or vacuum gauge warning mark, but no warning mark is present, the following reference values should be used: Start the engine and run it at just below the governed speed if diesel, or at 2,000rpm if petrol.Ĭheck the time it takes for the warning device to stop operating. Vehicles first used before 1 October 1937 do not need to be tested for air and vacuum systems.Ī vehicle with an ULW up to and including 3,050kg, with a reservoir coupled direct to the induction manifold or a reservoir integral in a servo unit, does not need to be fitted with a warning device.Ĭompletely empty the reservoir by repeatedly pressing the service brake pedal. (c) Anti-slip provision missing, loose or worn smooth In such cases the extent of reserve travel should be assessed during the brake test. It may be possible on motorcycle derived systems for the brake lever to touch the handlebar. Checks on vehicles with power-assisted braking systems should be carried out with the engine off. It is not a defect if the design pattern of the brake pedal rubber is worn smooth.Ī vehicle should only be failed for insufficient reserve if the pedal or lever is touching the floor/handlebar. Often a vehicle is fitted with an aftermarket brake pedal rubber. However, you should not reject a brake pedal if the vehicle has been manufactured with one that does not have grooves or anti-slip material. You should reject a brake pedal if its grooves or raised grip sections are worn smooth. However, some vehicles may have been manufactured with a brake pedal which did not incorporate grooves or the fitting of an anti-slip material and these should not be rejected. Service brake pedal or hand lever condition and travelĪ brake pedal rubber is an anti-slip material and is therefore not regarded as a defect if it’s worn smooth.Ī brake pedal without a rubber usually has grooves or raised sections to provide grip in wet conditions and should be rejected if it’s worn smooth. Service brake pedal or hand lever pivot Defectġ.1.2. Additional braking device (retarder), if fittedġ.1.1. Brake actuators - including spring brakes, hydraulic cylinders and callipers Brake servo units and master cylinder (hydraulic systems) Service brake pedal or hand lever condition and travel ![]()
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