Front Brakes - Noise/Squeal
87saab02FILE IN S.I. Man VOL. I
SEC. A-5 PG. 31
Service Information
SUBJECT: FRONT BRAKE NOISE ISSUE: 08/87-988
APPLICATION: M79-87 900 MODELS
Some brake noise can occur with the original equipment brake pads installed on the Saab 900, especially cars equipped with M83-86 type brake pads. Brake noise (squeal) is most likely to occur when a car is braked lightly under warm, dry conditions. Small amounts of noise should be considered noral.
This Service Information contains advice for addressing an owner complaint of loud brake noise rather than the intermittent low noise complaint.
Always use original Saab brake pads when performing this operation. Brake pads listed here meet the Saab performance requirements and are asbestos-free. These pads were introduced as from M87.
Parts Required
Brake Pad Outer (DM 121) 91-02-690*
Brake Pad Inner (Textar 474) 91-02-708*
Pad "U" Pin (solid disc) 89-90-194
Pad "U" Pin (ventilated disc) 91-00-108
Spring Clip 91-03-995
Damper Spring 89-30-448
*Use only in combination given.
FIGURE 1 - FRONT WHEEL BRAKE ASSEMBLY.:
Repair Procedure
1. Remove the "U" pin, spring clip, damper spring and the brake pads (Figure 1).
FIGURE 2 - LUBRICATE WITH GLEITMO 540.:
2. Check that the yoke can slide freely in its grooves in the brake housing. Lubricate with Gleitmo 540 (P/N 30-08- 612) as shown in Figure 2. Do not overlook this important step as vibration in the yoke can cause brake squeal.
FIGURE 3 - SPRING CLIP. ORIGINAL AND NEW STYLE.:
3. Install a new style spring clip (P/N 91-03-995). Spring clips purchased from the spare parts supply have different dimensions from the clip originally fitted to the caliper. See Figure 3.
FIGURE 4 - PAD INNER/OUTER COMBINATION.:
4. Turn in the pistons and install the semi-metallic 2-pad combination which was introduced into the spare parts system from 07/86. This is the same combination of pads installed from the beginning of M87 new car production. See Figure 4.
Brake Pad Outer (DM 121) 91-02-690
Brake Pad Inner (Textar 474) 91-02-708
Do not substitute aftermarket brake pads.
Note! See Service Information 07/86-862 on installing brake pads. Proper installation is critical to prevent brake piston over-adjustment and possible brake drag.
FIGURE 5 - INSTALL DAMPER SPRING AND PAD "U" PIN.:
5. If the car is more than 1 year old, install new damper springs (P/N 89-30- 448) as shown in Figure 5.
6. Install new pad "U" pins (Figure 5). The "U" pin has a preset bend which can be altered by heat and hard use. The "U" pin controls vibration and locates the pads properly in the caliper. Note the different "U" pins for ventilated and non-ventilated brake calipers.
Pad "U" Pin (solid disc) 89-90-194
Pad "U" Pin (ventilated disc) 91-00-108
Install the retaining clip through the "U" pin.
FIGURE 6 - SET HAND BRAKE BEFORE PUMPING UP THE BRAKES.:
7. Pull up the hand brake lever 7 notches. Start the engine and pump the brake pedal until the hand brake lever will operate in 9-10 notches. See Figure 6.
8. Road test the car to verify correct brake function but do not overheat the pads with repeated braking.