What kind of brake does a GM FWD vehicle use?
A prime example of this are GM FWD vehicles that are equipped with duo-servo rear drum brakes. Most FWD vehicles use a non-servo rear drum brake because of the braking balance of a FWD vehicle. These GM vehicles are “over-braked” in the rear which makes them very sensitive to rear brake problems.
How big is the brake drum on a GM Truck?
PlantPontiac, MIProduction Seq. Number:205747Body Type:2 Door Cab; RegularTrim Level:BaseDriveline Type:4WDGVWR Class:Class E: 6,001-7,000 lbBrake System:HydraulicSeries:1/2 tonVehicle Class:Full-size PickupEngine Series Code:WRN L31Fuel Type:GasolineManufacturer:General Motors CorporationEngine Code:R Why don’t you want to pull a wheel?
Why are my brake shoes square with the drum?
The shoe lands or “bosses” are an often overlooked item when looking for the cause of a rear wheel lockup condition. The shoe lands keep the brake shoes square with the drum and provide a friction surface for the shoes to move against.
What causes rear drum brakes to engage too soon?
If the parking brake system is not de-adjusted properly before the brake shoes are adjusted it will cause the rear brakes to engage too soon. This is especially true of vehicles equipped with duo-servo rear drum brakes (see Figure 61.1).
A prime example of this are GM FWD vehicles that are equipped with duo-servo rear drum brakes. Most FWD vehicles use a non-servo rear drum brake because of the braking balance of a FWD vehicle. These GM vehicles are “over-braked” in the rear which makes them very sensitive to rear brake problems.
PlantPontiac, MIProduction Seq. Number:205747Body Type:2 Door Cab; RegularTrim Level:BaseDriveline Type:4WDGVWR Class:Class E: 6,001-7,000 lbBrake System:HydraulicSeries:1/2 tonVehicle Class:Full-size PickupEngine Series Code:WRN L31Fuel Type:GasolineManufacturer:General Motors CorporationEngine Code:R Why don’t you want to pull a wheel?
The shoe lands or “bosses” are an often overlooked item when looking for the cause of a rear wheel lockup condition. The shoe lands keep the brake shoes square with the drum and provide a friction surface for the shoes to move against.
If the parking brake system is not de-adjusted properly before the brake shoes are adjusted it will cause the rear brakes to engage too soon. This is especially true of vehicles equipped with duo-servo rear drum brakes (see Figure 61.1).
Why are the hold down Springs on my rear brake so weak?
Hold down springs are designed to keep the brake shoe firmly against the backing plate. If the hold down springs are weak then the shoe could cock causing a binding condition. The replacement of rear shoe hardware should be suggested each time the rear brake shoes are replaced to prevent this from happening.
What causes rear wheel lockup on Phoenix brakes?
The shoe lands or “bosses” are an often overlooked item when looking for the cause of a rear wheel lockup condition. The shoe lands keep the brake shoes square with the drum and provide a friction surface for the shoes to move against. Over time the bosses can become grooved and corroded as in Figure 61.6.