Adjust (Cont) -725550744

TM 9-2330-385-14

4-34. ADJUST BRAKES (CONT).

Do not work under trailer unless the wheels of the truck and trailer are chocked, the trailer is

on level ground and the truck engine is shut off. Failure to chock wheels of truck and

trailer could cause serious injury or death to personnel.

An assistant must be in the truck cab at all times while checking brakes under trailer to

prevent truck movement. Failure to have an assistant in truck cab to prevent truck

movement could cause serious injury or death to personnel.

Do not hook up trailer drawbar or trailer safety chains while checking brakes under truck.

If trailer safety chains or drawbar are hooked up, the trailer could be dragged if the truck

should move, causing serious injury or death to personnel.

(10)

With the aid of an assistant, start truck and

allow air pressure to build up to 100 psi (689

kPa) minimum.

(11)

Measure distance between center of large

clevis pin (7) and bottom of brake

chamber (1) (measurement C), with brake in

released position. Record measurement.

(12)

With the aid of an assistant, apply brakes

while measuring distance from center of

large clevis pin (7) to bottom of brake

chamber (1) (measurement D).

The adjusted stroke must not exceed two in. (51 mm), or damage to the brakes may result.

The adjusted stroke should be as short as possible, but not so short that the free stroke is

less than 5/8 in. (16 mm).

The button must be pulled out before turning the manual adjusting nut or damage to

equipment will result.

NOTE

The difference between the measurements D and C is the adjusted chamber stroke.

(13)

Pull out button (2) and turn manual adjusting nut (4) on slack adjuster (3) to adjust the brake. The

adjusted stroke length must not exceed two in. (51 mm).

4-412