Attention: It is necessary to replace all brake pads of one axle of the vehicle at the same time, even if only one of them has reached the wear limit! Use only pads approved for use by the manufacturer!
Removal
Caution: After removing the brake pads, do not press the brake pedal, otherwise the piston may be pushed out of the housing. In this case, you will have to go to a service station to install the piston back.
1. Set the parking brake, remove the front wheels and place the front of the vehicle on stands.
2. Remove the lower caliper guide pin bolt (see accompanying illustration) and rotate the caliper on the axis of the upper guide pin upward, while making sure that the brake hose is not too tight.
5.2. Bolt (2) of the lower guide pin of the caliper mounting (1)
3. Remove the brake pads from the guide (see accompanying illustration).
5.3. Brake pads (4) are installed in the guide of the front disc brake mechanism: 3. Brake mechanism piston
Note: If you plan to reinstall the same brake pads, mark their installation locations when removing them. It is not allowed to switch the brake pads from the outer side to the inner side and from the right wheel to the left!
Examination
4. Sweep away any dust that has accumulated on the surfaces of the brake components (see Precautions in Section 1). Wipe the caliper and piston end surface with a clean rag. Remove rust from the edge of the brake disc.
5. Check the condition and thickness of the brake pads (see Chapter 1, Section 14) Oily pads must be replaced without fail - first eliminate the cause of the leak. Check the surface of the brake disc with your fingers by touch. A brake disc with unevenness can be turned if it is thick enough - contact a specialist.
Caution: Both brake discs on the same axle must be turned to the same thickness. If the disc thickness has reached its maximum wear (see Specifications), replace both discs of one axle.
6. If the condition of the brake pads and disc is found to be satisfactory, thoroughly clean them and the contact surfaces of the brake discs from dirt with a soft wire brush, paying special attention to the back and sides. Clean the grooves in the friction linings, completely removing foreign inclusions from them. Clean the seating places of the pads in the caliper and anchor bracket. After this, wipe all mating surfaces with a rag moistened with alcohol.
Attention: To clean the brakes, use only alcohol or liquids specially designed for this purpose, and to avoid damaging the sealing cuffs, do not use tools with sharp edges!
7. The guide pins should move easily in the caliper bushings; clean the pins if necessary. Check the condition of the piston sealing cuff, inspect the piston for signs of developing brake fluid leaks, traces of corrosion and mechanical damage. Replace defective components. Disassembling the caliper for restoration repairs and replacing the piston cuff should only be done at a service station.
Installation
8. When installing new pads, the piston must be sunk into the caliper cylinder to free it up for installing thicker new pads. The piston is pressed back using a special device (for example, Hazet 4970/6), although a clamp of a suitable size or a wooden lever will work no less effectively (see accompanying illustration), if necessary, place an old brake shoe as a support surface in front of the piston. Be careful not to damage the piston surface and protective cap. When the piston returns, brake fluid is squeezed out of the brake cylinder into the reservoir, so the reservoir cap must be removed. To prevent brake fluid from leaking out, first check its level - pump out excess if necessary.
5.8. Pressing the brake piston using a wooden lever
Caution: Pressing the piston down carries the risk of damaging the sealing lip and the piston surface - use caution!
9. Before installing new brake pads, clean the mating surfaces of the brake mechanism and guides. Lubricate the guide surfaces of the pads with a thin layer of heat-resistant grease.
10. Insert the brake pads into the guide, making sure they are installed correctly - the inner pad has a stop for the brake mechanism piston.
11. Install the caliper on the guide, screw in the lower guide pin mounting bolt, tighten with the required torque (28 Nm).
12. Press the foot brake pedal several times until you feel a firm movement - the brake pads are adjacent to the discs and occupy a position corresponding to the operating condition.
13. Proceed in a similar manner to replace the brake pads of the opposite wheel.
14. Install the wheels, lower the vehicle to the ground and tighten the wheel bolts to the required torque.
15. Check the brake fluid level and make adjustments if necessary (see Chapter 1).
16. Before starting intensive use, allow the brake pads to rub in a little by braking the car several times from 80 km/h to 40 km/h by lightly pressing the pedal. Then allow the brake to cool down.
Note: After replacing the pads, try to avoid sudden braking for approximately 200 km.
Features of Corsa C models equipped with Z17DTH engine
Note: For these models, all the above requirements for checking and installing brake pads, as well as checking the operation of the brake system, apply.
17. Set the parking brake, remove the front wheels and place the front of the vehicle on stands.
18. Using a screwdriver, disconnect the spring clips (see accompanying illustration) brake pads from the caliper and remove them.
5.18. Removing the spring clip (1) of the front wheel brake mechanism
19. Remove the dust caps from the caliper guide pin holes (see accompanying illustration).
5.19. Dust caps (2) of guide pins (3) of caliper
20. Remove the guide pin mounting bolts and remove the caliper with the inner brake shoe. Remove the inner shoe from the caliper and tie the caliper to the strut with a piece of wire - do not leave it hanging by the hose.
(Original article on the web portal www.opelbook.ru)
21. Remove the outer shoe with the wear indicator from the guide (see accompanying illustration).
5.21. The outer shoe (1) of the front brake mechanism with the wear indicator (3) is installed in the guide (2) (z17DTH engine)
Note: If you plan to reinstall the same brake pads, mark their installation locations when removing them. It is not allowed to switch the brake pads from the outer side to the inner side and from the right wheel to the left!
22. Check the brake mechanism components (see above), replace any faulty parts if necessary.
23. Insert the outer brake shoe with the wear indicator into the guide (see illustration 5.21).
24. Press the brake piston using the Hazet 4970/6 tool or a suitable wooden block and insert the inner brake pad into the caliper (see accompanying illustration).
5.24. Installing the inner brake pad (5) into the caliper (z17DTH engine): 4. Brake cylinder
25. Clean the threads of the caliper guide pins, remove any remaining old compound.
26. Lubricate the new caliper mounting bolts with fresh locking compound (for example, Loctite 243), install the caliper on the guide and tighten the mounting bolts with a force of 28 Nm.
27. Further installation is carried out in the reverse order of removal.
Visitor comments