DESCRIPTION & OPERATION
All brake systems are operated hydraulically using a tandem master cylinder and vacuum power unit. All models have front disc brakes. Rear brakes are either drum or disc. Quest uses a Load-Sensing Proportioning Valve (LSPV) to regulate rear brake pressure.
Operational Check
With engine off, depress brake pedal several times until pedal height no longer changes. Press and hold brake pedal down. Start engine. If pedal goes down slightly, power brake unit is okay. If pedal does not move, check for air leak.