Symptoms
A pull to one side, a low or spongy pedal, or seeping wheel cylinders. Also any truck that has sat for years.
The fix, step by step
- Inspect every hose and steel line, since old trucks rust their lines from the outside.
- On 1969–70 trucks rebuild or replace the wheel cylinders, fit new shoes and adjust the drums.
- On 1971–72 trucks fit new pads and inspect the calipers and rotors.
- Bleed with fresh fluid from the wheel farthest from the master cylinder inward.
- Stainless front hoses are worth fitting on a lifted truck.
Tools & part numbers
- Line wrenches
- drum adjuster tool
- bleeder kit
- fresh brake fluid
Where to buy the parts
1971 Chevrolet Blazer brake parts catalogRockAuto ↗
Stainless braided brake linesOffroad Design ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Chevrolet K5 Blazer (1st generation) parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.