Front Disc Brakes - Design Changes
87hyundai01Group: CHASSIS
Number: 006
Date: APRIL, 1987
Model: EXCEL
DISC BRAKE DESIGN CHANGED ON VEHICLES EQUIPPED WITH AUTOMATIC TRANSMISSIONS
The front disc brake assemblies have been changed from a solid rotor to a vented type on vehicles equipped with automatic transmissions. As a result, modifications have been made to many associated brake components including calipers and pads, steering knuckles, dust covers, proportioning valve and bracket, and brake lines.
NOTE: This change will apply to manual transmission equipped vehicles at a later date.
Production Change Effective
Date
3-2-87
Part Number Information
See most recent microfiche.
Interchangeability
Code N Old - not interchangeable with - New
Service Procedures
The following service procedures and specifications are provided for your use. Please refer to them whenever servicing the vented rotor brake system. When servicing the solid rotor brake system, please refer to the appropriate service manual.
REPLACEMENT OF BRAKE PADS
REMOVAL
1. Remove the lower bolt and lift the caliper up and out.
2. Remove the pads.
CAUTION:
Be careful not to depress the brake pedal while disassembling the pads.
INSPECTION
1. Check the pads for wear or contamination and replace if necessary.
CAUTION:
The pads for the right and left wheels should be replaced at the same time. Never "split" or intermix brake pad sets. All four pads must be replaced as a complete set.
Standard Value Service Limit
Pad lining thickness 10.0 (0.394) 1.0 (0.039)
mm (in.)
INSPECTION
1. Check caliper for wear, damage, cracks and rust.
2. Check piston for rust, damage, cracks and wear on outer surface.
3. Check sleeve and pin for damage and rust.
4. Check pad spring and boots for damage.
5. Check carrier for damage, rust, wear and cracks.
CAUTION:
(a) Do not use sand paper on piston surface
(b) All removed rubber parts except bleeder cap must be replaced with new ones.
6. Inspect disc rotor using caliper and dial gauge. Replace if necessary.
Standard value Service limit
Thickness of disc 19 (0.75) 17 (0.67)
mm (in.)
Runout of disc - 0.1 (0.004)
mm (in.)
ASSEMBLY
1. Clean the components with isopropyl alcohol except pad and shim.
2. Apply rubber grease to the piston seal and then install in the caliper cylinder.
3. Assemble the piston and piston boots according to the following procedure.
(a) Apply rubber grease to caliper cylinder inner face, sliding surface of the piston and piston boot.
(b) Install the piston boot on the piston as illustrated.
(c) Insert the piston boot to the-inner groove of cylinder and slide the piston into the cylinder.
4. Assemble the sliding parts according to the following procedure.
(a) Apply rubber grease to the sliding surface of the sleeve and pin, sliding bore of caliper, pin boots and sleeve boots.
(b) Install the boots to the groove of caliper.
5. Fit the pads.
NOTE: Do not apply grease to disc and pads.
6. Tighten the brake hose fitting.
Tightening Torque N-m (kg-cm, ft.lbs.)
Sliding pin 34-44 (350-450, 25-33)
Sliding bolt 22-31 (220-320, 16-23)
Carrier mounting bolt 64-74 (650-750, 47-54)
Brake hose fitting 25-29 (250-300, 18-22)
NOTE:
(a) Bleed the system.
(b) Depress the pedal several times and confirm proper operation of system.
(c) Check system for leakage.