Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD1993E 350 VAN V8-7.3L DSLREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESHARD PEDAL
1993 Ford E 350 Van V8-7.3L DSL
Hard Pedal
1993 Ford E 350 Van V8-7.3L DSLSECTION Hard Pedal
CAUSES
- No assist from the brake booster. The vacuum operated brake booster may be defective or not receiving a sufficient supply of vacuum.
- Brake linings contaminated with brake fluid, oil, or grease. The contamination reduces the stopping ability of the brakes.
- Worn brake linings. Severely worn brake linings have a greatly reduced stopping ability.
- Glazed brake linings (overheated). Brake linings which have been severely overheated (cracked, shiny, charcoal like appearance) have a greatly reduced stopping ability.
- New brake linings not seated. Newly installed brake linings require a break in period of approximately 50 miles. Until the new brake linings are properly seated, overall braking performance will be less than 100%. Braking performance will gradually increase as the new linings are broken in.
Break-In Procedure
- Initially make 8-10 slow and gradual brake applications, slowing from 25 to 10 miles per hour.
- Severe braking or locking up the brakes should be avoided (unless dictated by an emergency or driver safety) for the first 50 miles.
WHAT TO CHECK FOR
- Check for proper brake booster operation.
- With the engine "OFF", depress and release the brake pedal 4-5 times.
- Depress the brake pedal firmly and start the engine.
- If the pedal goes down slightly the brake booster is operating properly.
- If the pedal does not go down slightly the brake booster is not assisting in brake operation. Verify vacuum supply to the booster.
- Maintain pressure on brake pedal while turning "OFF" engine. The pedal should remain in the same position. If the pedal slowly slowly rises, the booster or vacuum check valve is leaking. Replace as necessary.
- Verify the brake booster vacuum line is intact and installed properly. Verify that the vacuum check valve allows flow only towards the intake manifold, and not in reverse towards the booster.
- Verify that engine vacuum is at least 17 in hg.
- Inspect brake linings for sufficient thickness, contamination, and evidence of overheating. Replace as necessary.
- No assist from the brake booster. The vacuum operated brake booster may be defective or not receiving a sufficient supply of vacuum.
- Brake linings contaminated with brake fluid, oil, or grease. The contamination reduces the stopping ability of the brakes.
- Worn brake linings. Severely worn brake linings have a greatly reduced stopping ability.
- Glazed brake linings (overheated). Brake linings which have been severely overheated (cracked, shiny, charcoal like appearance) have a greatly reduced stopping ability.
- New brake linings not seated. Newly installed brake linings require a break in period of approximately 50 miles. Until the new brake linings are properly seated, overall braking performance will be less than 100%. Braking performance will gradually increase as the new linings are broken in.
Break-In Procedure
- Initially make 8-10 slow and gradual brake applications, slowing from 25 to 10 miles per hour.
- Severe braking or locking up the brakes should be avoided (unless dictated by an emergency or driver safety) for the first 50 miles.
WHAT TO CHECK FOR
- Check for proper brake booster operation.
- With the engine "OFF", depress and release the brake pedal 4-5 times.
- Depress the brake pedal firmly and start the engine.
- If the pedal goes down slightly the brake booster is operating properly.
- If the pedal does not go down slightly the brake booster is not assisting in brake operation. Verify vacuum supply to the booster.
- Maintain pressure on brake pedal while turning "OFF" engine. The pedal should remain in the same position. If the pedal slowly slowly rises, the booster or vacuum check valve is leaking. Replace as necessary.
- Verify the brake booster vacuum line is intact and installed properly. Verify that the vacuum check valve allows flow only towards the intake manifold, and not in reverse towards the booster.
- Verify that engine vacuum is at least 17 in hg.
- Inspect brake linings for sufficient thickness, contamination, and evidence of overheating. Replace as necessary.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.