Lock front right tire up when pressing brakes

Hi and thanks for using 2CarPros.com.

Based on your description, it sounds like the master cylinder may be bad. This unit is a tandem master cylinder. The primary (rear) circuit feeds right front and left rear brakes. The secondary circuit (front) feeds left front and right rear brakes. What I need you to check is if the if the right rear brake is working. It sounds like the secondary circuit of the master cylinder may have failed. Check to see if there is pressure to the right rear brake. If there is not, replace the master cylinder.

I attached the directions for removal and replacement of the master cylinder in case you need them. They are specific to your car. All attached pictures correlate with these directions. The link below contains general directions for replacement of the master cylinder. It also explains how to bench bleed the new master cylinder before install.

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

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CAUTION: Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, drip pans and fender covers to prevent brake fluid from contacting these areas.

1. Apply the brake pedal several times to exhaust all vacuum in the system.
2. Remove brake tubes from primary and secondary outlet ports of brake master cylinder. Cover the ends of the lines to prevent dirt from entering system.
3. Disconnect fluid level indicator switch connector.
4. Remove nut retaining cowl top inner panel tube to brake master cylinder.
5. Disconnect cowl top inner panel tube from cowl and remove.
6. Remove two nuts retaining brake master cylinder to power brake booster assembly.

Master Cylinder
7. Slide brake master cylinder forward and upward from vehicle.

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INSTALLATION
CAUTION: Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, drip pans and fender covers to prevent brake fluid from contacting these areas.

1. Before installing the master cylinder, check the distance from the outer end of the booster assembly push rod to the face of the brake booster assembly.
Master Cylinder
i 2. Position brake master cylinder assembly on studs on power brake booster assembly.
3. Install mounting nuts. Tighten to 26-39 Nm (19-28 lb ft).
4. Connect cowl top inner panel tube to cowl.
5. Install nut retaining cowl top inner panel tube to brake master cylinder and tighten to 21-29 Nm (16-21 ft lb).
6. Install primary and secondary brake tubes to brake master cylinder outlet ports. Tighten to 16-20 Nm (12-15 ft lb).
7. Connect brake warning indicator switch connector.
8. Fill master cylinder with DOT 3 brake fluid to MAX line on side of reservoir.
9. Bleed the master cylinder. Refer to Brake Bleeding.
10. Perform system brake bleeding procedures.
11. Operate brakes several times; then check for external hydraulic leaks.

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I hope this helps. Let me know if this is the issue.

Take care,
Joe

The master is separated from front to rear. Do both front brakes act the same or just one side? If it is just one side the problem will be the caliper/flex hose. Does this car have ABS?

This car can have ABS, can you lift the hood and look for the ABS controller (all brake lines will run into it will a motor and controller)?

Nope they are front and rear. When the problem happens can you loosen the master cylinder mounting bolts so the master can move way from the booster 1/4 inch to see if the problem goes away if so the booster push rod is adjusted too far out.

It sounds like a caliper slide is sized. Can you confirm both caliper can move freely?