Chrysler RAM50/D50/Arrow 1979-1993 Repair Guide

Brake Pads

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CAUTION
Brake pads and shoes may contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from brake surfaces! When cleaning brakes, use commercially available brake cleaning fluids.


WARNING
If the vehicle has been recently driven before repairs, all the brake surfaces and components may be very hot. Work carefully and wear gloves.

REMOVAL & INSTALLATION



See Figures 1 through 7

Whenever brake pads are replaced, replace them in complete sets; that is, replace the pads on both front wheels even if only one side is worn.

There are several combinations of shims, spacers and clips in use on these vehicles. When disassembling, work on one side at a time and pay attention to placement of these components. If you become confused during reassembly, refer to the other side for correct placement. To remove the brake pads:



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Fig. Fig. 1: Use the inspection hole to check the thickness of the front caliper brake pads

  1. Raise the vehicle and support it safely on stands.
  2.  
  3. Remove the front wheels.
  4.  
  5. Remove the approximately 1 / 2 the fluid in the master cylinder.
  6.  
  7. On 1979-86 models, remove the spigot spring and pull the stopper plug from the upper end of the caliper. Remove the pad support plates, and pull the caliper assembly back and forth to loosen and remove it from the caliper support. Support the caliper with a wire hook.
  8.  



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Fig. Fig. 2: Exploded view of the disc brake assembly-1979-86 models



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Fig. Fig. 3: Pull the stopper plug from the upper end of the caliper with pliers



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Fig. Fig. 4: Pull the caliper assembly back and forth to loosen and remove it from the caliper support



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Fig. Fig. 5: Remove the lockpin bolt from the caliper, lift the caliper up and secure it in place with a wire or strong cord



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Fig. Fig. 6: Note the positions of the various shims, clips and pads so that reassembly is easier



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Fig. Fig. 7: Before installing the new brake pads to the caliper, install the outer and inner shims to the pads


WARNING
Do not allow the caliper to hang from the brake hose.

  1. If equipped, unscrew and remove the lockpin without disturbing the grease coating. Place the pin in a clean spot where grease will not pick up dust.
  2.  
  3. Lift up the caliper body by using the guide pin bolt as a fulcrum. Fasten the caliper in the raised position with wire.
  4.  


WARNING
There is a coating of special grease on the lockpin. Be careful that this grease is not removed, and that dirt does not contaminate the grease on the pin.

  1. Remove the shims, brake pads and spring clips in order. Depending on the number of such components, either diagram their placement or lay them aside in order.
  2.  
  3. Clean the surface of the piston with a clean, damp rag. Make sure there is room in the master cylinder reservoir for more fluid (fluid will be forced back into the reservoir in the next step). If necessary, remove some fluid with a clean squeeze ball syringe.
  4.  
  5. Use a large C-clamp or similar tool to depress the caliper pistons back into the calipers. The pistons will need to be almost flush with the case to fit over the new, thicker pads.
  6.  
  7. Install the brake pads with the shims, clips and fittings in the correct order. Vehicles with upper and lower spring clips for each pad should have these clips replaced with the pads.
  8.  

Keep the brake surface of each pad free of grease, oil and fluids during the installation. A greasy fingerprint or similar light contact may be removed with a commercial brake cleaning spray.

  1. Remove the wire, lower the caliper into position, and screw in the lower lockpin (if equipped). Make certain the rubber boot is correctly placed on the lockpin and is not pinched or deformed. On other models, Slip the caliper over the pads ands install the support plate, stopper plug, and the spring pin.
  2.  
  3. Replace the wheels and lower the vehicle.
  4.  


WARNING
Do NOT attempt to drive the vehicle immediately after lowering it to the ground. The first two or three brake pedal applications may not provide any brake response.

  1. Pump the brake pedal several times with the engine OFF . The first two or three pedal strokes may be longer than usual as the pistons return from their compressed position and drive the pads inward. After a reasonable feel has been achieved, check the master cylinder reservoir and top up the fluid as needed. Start the engine and pump the brake pedal again, checking for the proper feel and engagement point.
  2.  
  3. Since the brake hoses and hydraulic system was not opened during the repair, it is usually not necessary to bleed the brake system after pad replacement. Use good judgment in determining pedal feel; bleeding may be necessary for other reasons.
  4.  

Braking should be moderate for the first 10 miles (16 km) or so until the new pads seat correctly. The new pads will bed best if put through several moderate heating and cooling cycles. Avoid hard braking until the brakes have experienced several long, slow stops with time to cool in between. Taking the time to properly bed the brakes will yield quieter operation, more efficient stopping and contribute to extended brake life.

INSPECTION



See Figures 8 and 9

The front brake pads may be inspected without removal. With the front end elevated and supported, remove the wheel(s). Unlock the steering column lock and turn the wheel so that the brake caliper is out from under the fender.

View the pads-inner and outer-through the cut-out in the center of the caliper. Remember to look at the thickness of the pad friction material (the part that actually presses on the disc) rather than the thickness of the backing plate which does not change with wear.

Remember that you are looking at the profile of the pad, not the whole thing. Brake pads can wear on a taper which may not be visible through the window. It is also not possible to check the contact surface for cracking or scoring from this position. This quick check can be helpful only as a reference; detailed inspection requires pad removal.

After the pads are removed, measure the thickness of the LINING portion (NOT the backing) of the pads. It must be at least 0.04 in. (1mm) for all 1983-86 vehicles and 0.08 in. (2mm) for all vehicles built after 1987. This is a factory minimum+ease note that local inspection standards enforced by your state must be given precedence if they require a greater thickness.



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Fig. Fig. 8: Using a ruler can help determine the pad thickness



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Fig. Fig. 9: Use the inspection hole to check the thickness of the brake pads

 
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