Brakes - Brake Booster Check Valve Test Revision

Group
50 - CHASSIS

Number
97-50-001

Date
02-1997

Model
Accent 1995-1997

Subject
ACCENT BRAKE BOOSTER CHECK VALVE (SHOP MANUAL CORRECTION)

DESCRIPTION:





The brake booster check valve illustration and corresponding vacuum check valve test procedure shown in the 1995 - 1997 Accent Shop Manual is incorrect. The correct illustration and vacuum check valve test procedure for the brake booster check valve are shown.

Please note the corrections and write the TSB number at the bottom of the following pages in the appropriate Shop Manual for future reference.

^ 1995 Accent Shop Manual - page 58-15
^ 1996 Accent Shop Manual - page BR-15
^ 1997 Accent Shop Manual - page BR-15

ANALYSIS:

The 1995 and later model Accents incorporate the brake vacuum check valve inside the vacuum hose assembly (and not between the two vacuum hoses as shown) leading from the intake manifold vacuum connector to the brake booster nipple. The purpose of this check valve is to maintain a limited vacuum reserve in the brake booster.

VACUUM CHECK VALVE TEST PROCEDURE:

1. Remove the brake booster vacuum hose from the vehicle.





2. Using an external vacuum pump, apply vacuum to the booster side of the vacuum hose. If vacuum is held, the check valve is good. Proceed to step 4.

3. If there is no vacuum held, the check valve is leaking and the vacuum hose assembly must be replaced.





4. Again, using the external vacuum pump, apply vacuum to the intake manifold side of the vacuum hose. No vacuum should be held. If there is vacuum, the vacuum line of the check valve is plugged and the vacuum hose assembly must be replaced.

CAUTION
Do not attempt to clean the vacuum hose or check valve.