I plan to replace all the pads and rotors on my 1998 V70 GLT. Do I require a tool to retract the rear caliper pistons or will they press in like the front do.
This model has seperate brake shoes for emerg / hand brake.
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Re: volvo V70 1998 brake repair
You can push them in by hand although a tool to spread the pads apart is quicker. You have to grab the caliper and rotate with some force to spread the pads a bit it to get it off the car in the first place.
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brakes are brakes, push in , turn in, or two piece calipers. remove wheel , remove two bolts that hold caliper in place, remove replace pads if rotors look good if not remove caliper retainer and rotor replace or have resurfaced at local part store with service. if push in piston push in with c-clamp or piston tool, if turn in will be solid on top with slots for tool to turn in turn to right, tool can be gotten at parts store, if two piece take apart and put back then bleed brakes.
Remove the caliper mounting bolts and remove the caliper. Replace brake pads as necessary. Special tool is required to retract caliper piston to fit over new pads. (see picture below) Retract piston in caliper using special tool to rotate clockwise and make sure the notch in the piston is aligned properly so the tab on the inner pad will fit in properly. Reinstall caliper assembly and caliper mounting bolts.
Hi, if this is a front caliper that is still on the rotor, I pry between the rotor and rear brake pad to push the piston in. I usually have to pull on the caliper a bit to get it retracted enough to get a screwdriver in between. If the caliper is already off the rotor, I leave the old inside pad on the piston and put a large c-clamp over the caliper to push on the pad and retract the piston. If this is a rear disk caliper or if you have any questions, please reply.
A special tool is required to compress the caliper piston on the rear brakes-don't use a C-clamp on the piston. Raise the vehicle and remove the tire. The rear calipers have only one guide pin. Remove this pin and raise the caliper. Remove the old brake pads. Using the special tool compress the caliper piston-the piston will have one or two slots on it. These slots must in the correct position to remount the caliper. Install the new brake pads and slide the caliper back over the rotor and replace the guide pin. If the caliper doesn't slide over the rotor you'll need to reset the slots on the piston. Replace the tires and you're ready to go.
The rear calipers on these models require a special tool that compresses and turns the piston in at the same time -- most parts stores carry this tool. It is called a caliper piston press -- and it installs where the pads would go and acts like a c-clamp,when turning handle it will turn the caliper piston backinto the caliper as it compresses it. Anytime the brake rotor or brake pads are being replaced, the rear caliper piston must be seated (bottomed) to compensate for the new brake rotor or lining. Because the Parking Brake self-adjuster mechanism is attached to the piston, a special seating method is required. The only acceptable method is by rotating the piston back into the bore using Retractor,MILLER Special Tool 8807, . Any other seating method will damage the self-adjuster mechanism. Good luck and hope this helps.
In order to retract the pistons on the rear calipers you need to use a special tool that will rotate the piston in a clockwise direction.It may be possible to try to use a strong needle nose plier.Apply force against the U shaped slots on the piston and rotate clockwise until the piston bottoms out.Before you reinstall the caliper make sure that the recessed slots are at 12 and 6 "o"clock..the slots align with one or two bumps on the inside pad. If you are having problems with your calipers rebuilt one are a good option.If only the caliper slide pins are sticking they can be cleaned and lubricated.Pin lubricant sometimes comes with a set of brake pads.Other than that lube may be purchased separately at an automotive supply store.
Parts needed... Metric socket set. Large standard screwdriver and or small pry bar never-seize lubricant new brake pads 12" channel lock pliers or a caliper piston turning cube http://www.google.com/base/a/3862711/D14736274280982705237 Dead blow hammer Synthetic brake grease Aerasol brake cleaner Rubber gloves / safety glasses / facemask remove the 14mm bolt from the lower caliper slide. If the bolt will not turn with moderate force applied STOP! and take it to a garage to be dealt with as you are not equipped to remove a broken bolt. Heat will be required to remove it that only an oxy / acetylene rig can provide. if the bolt comes free proceed as follows. Remove bolt Insert prying tool between lower lip of caliper and rotor. Pry the caliper up. It will pivot on the other caliper slide and swing upwards allowing you to access the brake pads in the caliper mount. Remove the old pads one at a time by prying them away from the rotor face with a prying tool. Match each pad as it is removed with its corresponding replacement and insert. The pads are seated in metal clips and may require multiple attempts and mild force to install. You can use the handle of you hammer to tap them into place. Once the pads are installed you can continue with retracting the piston on the calipers. Using the piston cube or the pliers, rotate the caliper piston clockwise to retract it into the caliper again. This will take a while especially if you have pliers to work with. If the piston refuses to turn you will need to replace the caliper. This is best left to a garage that is familiar with bleeding ABS systems. Reinstall the old pads and the caliper and take it to a service center. Once the piston is retracted into the caliper you can remove the caliper from its guide pin. Slide the caliper away from you to remove it from the upper guide pin. lubricate the pin with synthetic grease and reinstall the caliper on the guide pin sliding it towards you as far as it will go to re-seat the rubber dust boot. Then rotate the caliper down over the new pads. Apply never-seize to the threads of the bolt and reinstall it. Apply moderate force when installing as excessive force will snap the bolt. Once finished clean the entire assembly with brake clean to remove any grease or dust that may have accumulated.
What are you using? A c-clamp or you hands? A c-clamp ussually works but can sometimes cause the piston to become ****-eyed in the caliper. Best bet is to use the proper tool or a c clamp. Both work good. If it won't retract with those, the piston is siezed. Time for a new caliper.
If you can't see diagrams(sometimes happens) let me know and I will get them to you
Raise and support the vehicle. Remove the rear wheels.
If equipped, disconnect the brake pad wear sensor from the harness.
Counterhold the lower sliding pin using a thin open-end wrench and remove the caliper-to-sliding pin hex bolt.
Pivot the caliper upward or if necessary remove the upper caliper-to-sliding pin hex bolt.
a brake caliper retraction tool, select the appropriate sized piston
press arbor and install the tool onto the brake caliper. Following the
tool manufacturer's recommendations, use the tool to rotate the caliper
piston clockwise as it is pressed into the brake caliper housing, until
it is fully retracted.
Use a thin open-end wrench to . . .. . . support the caliper sliding pin when removing the caliper mounting boltUse a disc brake caliper piston retracting tool that will rotate the caliper piston as it is pressed into the caliperThe rear caliper piston is slotted to allow a retracting tool to rotate the piston when replacing the brake padsTo install:
the brake caliper and all sliding surfaces. With the caliper piston
pressed fully back into the caliper housing, check for leaking fluid
and damaged dust boots.
If equipped, install a new brake pad
wear sensor in the pad if the plastic part has been worn through on the
old sensor. New sensors are not required unless the wire inside the
plastic part has been exposed.
Lubricate the slider bolts with approved brake grease.
the brake pads onto the bracket assembly, and then carefully lower the
caliper over the caliper mount. Check and make sure that the pad
springs are correctly seated.
Replace all removed caliper-to-sliding pin bolts and torque to:
1990-97 Passat models: 25 ft. lbs. (35 Nm)
1998-00 Passat models: 22 ft. lbs. (30 Nm)
equipped, connect the brake wear sensor wire to the harness. Check for
a good connection as most problems with the sensor circuit are caused
by faulty connections. Check that the wire is held by the loop in the
dust cover and the connector is held at the clips.
wheels and hand tighten the lug bolts. Lower the vehicle carefully
until the tires begin to contact the surface and torque the lug bolts
to specification in a crisscross pattern to: