The defect
ON THE INVOLVED VEHICLES, THE NUTS WHICH ATTACH THE BRAKE MASTER CYLINDER TO THE HYDRO-BOOST UNIT MAY HAVE BEEN OVER-TIGHTENED. THIS COULD HAVE CAUSED STRIPPED THREADS AND CRACKED ATTACHING FLANGES. SHOULD THESE NUTS FAIL, THE PARTS MAY SEPARATE AND LOSS OF SERVICE BRAKES WOULD RESULT.
The remedy
DEALER WILL INSPECT FOR CRACKS IN THE ATTACHING FLANGES; UNITS WITH CRACKS PRESENT WILL BE REPLACED. IF NO CRACKS ARE FOUND, THE STUDS WILL BE REMOVED AND THE HOLES DRILLED OUT. THE UNIT WILL BE REASSEMBLED USING BOLTS AND NUTS IN PLACE OF THE EXISTING STUDS.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|
Components: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
Other service brakes, hydraulic recalls in 1977
26 of the 245 recall campaigns reported to NHTSA in 1977 concerned the service brakes, hydraulic; GENERAL MOTORS CORP. filed 1,195 campaigns in all.
| 77V227000 20 Dec 1977 | AM GENERAL CORPORATION |
| 77V202000 16 Nov 1977 | CHRYSLER CORPORATION |
| 77V188000 25 Oct 1977 | CHRYSLER CORPORATION |
| 77V184000 19 Oct 1977 | VOLKSWAGEN OF AMERICA,INC |
| 77V182000 18 Oct 1977 | VOLKSWAGEN OF AMERICA,INC |
| 77V181000 17 Oct 1977 | GENERAL MOTORS CORP. |
| 77V164000 28 Sept 1977 | HARLEY-DAVIDSON MOTOR CO. |
| 77V158000 22 Sept 1977 | FORD MOTOR COMPANY |
NHTSA recalls (public domain) · all recalls of 1977