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Home >> Nissan-Datsun >> 2003 >> Maxima V6-3.5L (VQ35) >> Repair and Diagnosis >> Brakes and Traction Control >> Disc Brake System >> Service and Repair >> Front
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Front

Front Disc Brake





Component

Pad Replacement

WARNING: Clean brake pads with a vacuum dust collector to minimize the hazard of airborne particles or other materials.

CAUTION:
- When cylinder body is open, do not depress brake pedal because piston will pop out.
- Be careful not to damage piston boot or get oil on rotor. Always replace shims when replacing pads.
- If shims are rusted or show peeling of the rubber coat, replace them with new shims.
- It is not necessary to remove connecting bolt except for disassembly or replacement of caliper assembly. In this case, suspend cylinder body with wire so as not to stretch brake hose.
- Burnish the brake contact surfaces after refinishing or replacing drums or rotors, after replacing pads or linings, or if a soft pedal occurs at very low mileage.








1. Remove master cylinder reservoir cap.
2. Remove pin bolt.
3. Open cylinder body upward. Then remove pad with retainers, inner shim.
Standard pad thickness: 9.5 mm (0.374 inch)
Pad wear limit: 2.0 mm (0.079 inch)
Carefully monitor brake fluid level because brake fluid will return to reservoir when pushing back piston.

Removal





WARNING: Clean brake pads with a vacuum dust collector to minimize the hazard of airborne particles or other materials.

Remove torque member fixing bolts and connecting bolt.
It is not necessary to remove connecting bolt except for disassembly or replacement of caliper assembly. In this case, suspend caliper assembly with wire so as not to stretch brake hose.

Disassembly





WARNING: Do not place your fingers in front of piston.

CAUTION: Do not scratch or score cylinder wall.

1. Push out piston with piston boot with compressed air.
2. Remove piston seal with a suitable tool.





CAUTION: When removing the pad retainer from the torque member, lift it up and out in the direction of the arrows in the figure.

Inspection
CALIPER
Cylinder Body
- Check inside surface of cylinder for score, rust, wear, damage or presence of foreign materials. If any of the above conditions are observed, replace cylinder body.
- Minor damage from rust or foreign materials may be eliminated by polishing surface with a fine emery paper. Replace cylinder body if necessary.

CAUTION: Use brake fluid to clean. Never use mineral oil.

Piston

CAUTION: Piston sliding surface is plated. Do not polish with emery paper even if rust or foreign materials are stuck to sliding surface.

Check piston for score, rust, wear, damage or presence of foreign materials. Replace if any of the above conditions are observed.

Slide Pin, Pin Bolt and Pin Boot
Check for wear, cracks or other damage. Replace if any of the above conditions are observed.

ROTOR
Rubbing Surface
Check rotor for roughness, cracks or chips.

Runout





1. Secure rotor to wheel hub with at least two nuts (M12 x 1 25).
2. Check runout using a dial indicator.
Make sure that wheel bearing axial end play is within the specifications before measuring.
Maximum runout: 0.07 mm (0.0028 inch)
3. If the runout is out of specification, find minimum runout position as follows:
a. Remove nuts and rotor from wheel hub.
b. Shift the rotor one hole and secure rotor to wheel hub with nuts.
c. Measure runout.
d. Repeat steps a. to c. so that minimum runout position can be found.
4. If the runout is still out of specification, turn rotor with on-car brake lathe ("MAD DL-8700", "AMMCO 700 and 705" or equivalent).

Thickness
Thickness variation (At least 8 positions):
Maximum 0.01 mm (0.0004 inch)
If thickness variation exceeds the specification, turn rotor with on car brake lathe.
Rotor repair limit: 22.0 mm (0.866 inch)

Assembly





1. Insert piston seal into groove on cylinder body.
2. With piston boot fitted to piston, insert piston boot into groove on cylinder body and install piston.
3. Properly secure piston boot.

Installation

CAUTION:
- Refill with new brake fluid "DOT 3".
- Never reuse drained brake fluid.





1. Install brake hose to caliper securely.
2. Install all parts and secure all bolts.
3. Bleed air.





CAUTION: The upper pad retainer is built so the pad returns to its original position. Be careful to install the pad-return lever securely to the pad wear sensor, as shown.
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