940 L4-2320cc 2.3L DOHC VIN 89 B234F FI (1991)
Brake Proportioning/Combination Valve: Service and Repair
The Regulating Valve Must Be Replaced As An Assembly.
1. Disconnect brake pipe from valve, replace unions if necessary.
2. Remove valve from bracket, then disconnect brake hose from valve.
3. Install new valve and bleed system.
4. Ensure there are no leaks.