Question about 2004 Proton Gen-2

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Struggling to depress pistons on rear brakes. Hoave used G-clamp, Made a special tool with nut and bolt. Still struggling.

How can I depress the piston on the rear brake caliper fully.

Posted by Giel Swiegers on

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Steve

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The pistons in the caliper should retract without much effort. A "C" clamp is usually all you need to do it. I suspect you have a seized caliper or possibly a kinked or crushed brake line (preventing the brake fluid from returning to the master cylinder when the piston is depressed) feeding that caliper - but isn't very likely.

Posted on Aug 16, 2016

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Hi, Do I need a special tool to depress the caliper piston or can I use a G clamp? I did this on the front brakes but the rear piston seems a lot tighter.


You can use a "C" clamp...but be sure to use the old pad that goes on the piston side of the caliper...place the old pad back on the piston and then use the "C" clamp to depress the piston back into the caliper..this will prevent damage to the piston...also, to aid in this process, you can remove the brake fluid resevoir cap and put a towel around it so it doesn't leak all over the floor

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Park the polo on level ground, turn the engine off and apply the parking brake. Pull the hood release handle and move to the front of the car.

Lift the hood and remove the master cylinder. Remove one-half of the brake fluid inside the reservoir with a syringe.

Loosen the lug nuts on the rear wheels with a tire iron. Place the jack beneath the frame at the back of the Volkswagen and lift the back tires off the ground. Rest the rear axles of the Volkswagen on two jack stands. Remove the lug nuts and take the rear wheels off.

Reach behind the brake caliper to locate the caliper mounting pins. Remove the pins with a 12 mm socket and ratchet. Lift the caliper from the brake rotor and suspend it above the wheel assembly with a bungee cord or wire coat hanger.

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Attach the piston depression tool to the caliper. The tool will fit over the back side of the caliper and against the piston inside. Twist the tool's handle to force the piston into the side of the rear caliper. Remove the tool once the caliper piston is totally depressed within the caliper.

Replace the caliper onto the caliper bridge and screw in the caliber mounting pens by hand. Replace the rear wheel onto the wheel bolt and screw on the lug nuts.

Repeat the process for the other side of the rear of the polo. Lift the rear end of the vehicle with the jack and remove the jack stands. Lower the rear tires to the ground and tighten the lug nuts with a lug wrench.

Return to the engine compartment. Remove the master cylinder cap and check the level of brake fluid. Place a funnel into the container and fill the reservoir with brake fluid as needed.

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If you do not have the tool you can retract the piston by using a needle nose plier.
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Before installing be sure the two "U" shaped slots are at 6:00 and 12:00 Oclock.

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your rear brake has most likely a drum in hat style brake.

The caliper is not stuck, you need a special tool to rotate the piston of the brake caliper and depress it down. It is connected to your parking brake, that is why this security measure was taken.

the special tool looks like this :

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a ratchet fits in the center hole and depending on the style of piston you have you will need a specific side of this "cube" tool.
you may need to slide the pads out to see the piston.

I hope this helps, Goodluck!

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It must be turned clockwise while being pushed in. The local parts store will have a tool just for this purpose.

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