NCT Manual. - National Car Testing Service

47
BRAKE LINES/HOSES
NATIONAL CAR TEST (NCT) MANUAL 2012
Method of Testing
Brake Pipes
1. Examine all accessible brake pipes to ensure that they are in serviceable condition, free from chafing and external corrosion
and damage.
2. Check that rigid pipes are securely held by clips or other means, and that rigid pipes and flexible hoses are not positioned in
such a manner as to be fouled by moving parts.
3. Examine all flexible hoses to ensure they are not constrained in tight bends, that they have adequate room to move as
necessary without fouling any other parts of the vehicle, and that they are not chafed or otherwise damaged or perished.
4. Check whether there are any leaks in the system by having the brake applied while examining the system (in the case of
vehicles fitted with a vacuum servo or power operated brake, the engine must be idling during this test) (2) .
5. Examine flexible pipes for signs of weakness under pressure with the footbrake fully applied.
6. Examine brake pipes for repairs or unsuitable fitting (1) .
NOTES
1. Note: The repair or replacement of a brake pipe would require a test of the pipe under pressure on the lift
and a full roller brake test.
2. Provided the vacuum is maintained in the servo, the engine may be stopped.
ITEM
Brake Pipes, Flexible Hoses
REASONS FOR FAILURE
1 Perished, kinked, damaged or rusted to the
extent that the pipe is pitted.
2 Unsatisfactorily mounted/possibility of failing.
3 Leaks.
4 Fouling moving parts.
5 Bulging under pressure.
6 Inadequate repairs or unsuitable fittings.
Note: Couplings in brake pipes are acceptable provided they
have been fitted to a high standard of workmanship.
76