Chrysler Colt/Vista 1990-1993 Repair Information

Master Cylinder

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Be careful not to spill brake fluid on the painted surfaces of your car. Brake fluid is a great paint remover.

REMOVAL & INSTALLATION




CAUTION
Brake pads 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 any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

See Figures 1, 2 and 3



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Fig. Fig. 1: Master cylinder and booster - 1990-92 Colt hatchback and sedan



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Fig. Fig. 2: Master cylinder and booster - 1990-91 Vista

  1. Disconnect the fluid level sensor.
  2.  
  3. Disconnect the brake tubes from the master cylinder and cap them immediately.
  4.  



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Fig. Fig. 3: Master cylinder and booster - 1992-93 Vista

  1. Unbolt and remove the master cylinder from the booster.
  2.  
  3. Install the master cylinder to the booster. Connect the brake lines and the fluid level sensor. Torque the mounting bolts to 6-9 ft. lbs. (72-108 inch lbs.).
  4.  

OVERHAUL



See Figures 4, 5 and 6



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Fig. Fig. 4: Master cylinder exploded view - 1990 Colt



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Fig. Fig. 5: Master cylinder exploded view - 1990-91 Vista

This is a tedious, time-consuming job. You can save yourself a lot of trouble by buying a rebuilt master cylinder from your dealer or a parts supply house. The small difference in cost between a rebuilding kit and a rebuilt part usually makes it more economical, in terms of time and work, to buy the rebuilt part.

  1. Remove the master cylinder from the car.
  2.  



Click image to see an enlarged view

Fig. Fig. 6: Master cylinder exploded view - 1992-93 Vista

  1. Remove the reservoir caps and filters and drain the brake fluid. Discard this fluid.
  2.  
  3. Remove the piston stopper snap-ring from the open end of the master cylinder with a pair of snapring pliers, or other suitable tool.
  4.  
  5. Remove the stopper screw and washer (if equipped) from the bottom of the master cylinder and then remove the primary and secondary piston assemblies from the master cylinder bore.
  6.  
  7. Remove the caps on the underside of the master cylinder to gain access to the check valves for cleaning.
  8.  

Do not disassemble the brake fluid level gauge, if equipped.

  1. Discard all used rubber parts and gaskets. These parts should be replaced with the new components included in the rebuilding kit.
  2.  

Do not remove the master cylinder reservoir tanks unless they are leaking.

  1. Clean all the parts in clean brake fluid. Do not use mineral oil or alcohol for cleaning.
  2.  
  3. Check the cylinder bore and piston for wear, scoring, corrosion, or any other damage. The piston and cylinder bore can be dressed with crocus cloth, or a brake cylinder hone, soaked in brake fluid. Move the crocus cloth around the cylinder bore, not in and out. Do the same to the piston, if necessary. Wash both the cylinder bore and the piston with clean brake fluid.
  4.  
  5. Check the piston-to-cylinder bore clearance; it should measure 0.15mm. If greater clearance exists, replace the piston, the cylinder, or both.
  6.  
  7. Assemble the master cylinder. Soak all of the components in clean brake fluid before assembling them.
  8.  
  9. Clamp the master cylinder in a vise by one of its flanges. Fill the reservoirs with fresh fluid, and pump the piston with a screwdriver until fluid squirts from the outlet ports. Install the master cylinder and bleed the system.
  10.  

 
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