Front Brake Rattle With GM® Caliper Kits
By Rich Diegle, Automotive Editor
Owners of several General Motors vehicles may
experience a rattling noise coming from the front of their vehicles.
The problem affects the following 2000 and 2001 models:
- Buick® Century and Regal
- Chevrolet® Impala, Monte Carlo and Venture
- Oldsmobile® Intrigue and Silhouette
- Pontiac® Grand Prix and Montana
This annoying rattle usually occurs at vehicle
speeds under 30 mph (48 km/h) and while driving over bumps. A light
application of the brake pedal usually eliminates the noise.
The cause is too much clearance between the front
brake caliper bracket and the caliper pins in the bottom of the
bracket bores. GM offers a front brake caliper service kit that
should eliminate the problem (P/N 18046457). Install the brake caliper
kits to both sides of the vehicle using the following service procedure.
Each kit contains 2 pins, 2 boots, and 2 packets of grease.
(Review safety procedures contained in the
ALLDATA® system before beginning)
GM, Buick, Century, Regal, Chevrolet, Impala,
Monte Carlo, Venture, Oldsmobile, Intrigue, Silhouette, Pontiac, Grand
Prix and Montana are registered trademark names and model designations
of the General Motors Corporation and are being used solely for reference
and application purposes.
and suitably support the vehicle, then remove both front tires
- Install and hand-tighten at least two wheel
nuts to retain the rotor to the hub.
- Install a large C-clamp (2) over the top
of the brake caliper and against the back of the outboard brake
- Tighten the C-clamp until the caliper piston
is pushed into the caliper bore enough to slide the caliper off
the rotor, then remove the C-clamp from the caliper.
- Remove the caliper pin bolts (3) and discard.
New bolts are supplied with the service kit.
- Remove the caliper (1) from the caliper bracket
(2) and support the caliper
with heavy mechanic's wire, or equivalent.
- Using a flat bladed tool or punch, carefully
tap the caliper pin boots from the brake caliper bracket and discard.
- Carefully insert a small screwdriver into
the brake caliper bracket bore, then rotate and pull the bushing
outward to remove. Discard the bushings.
- Remove the brake pads from the brake caliper
- Thoroughly clean the brake caliper bracket
bores of all lubricant.
- Install the brake pads into the brake caliper
- Lubricate the brake caliper bracket bores
by dividing the large packet of grease (supplied in the kit) and
putting one-half of a packet into each bore.
- Lubricate the new caliper pin boots by using
the small packet of grease (supplied in the kit) only on the bottom
internal threads (2).
- Install the new caliper pin boots into the
caliper pin bores (3) on the bracket. Carefully tap boots into
bores using a deep well socket or equivalent.
- Install the caliper over the rotor and onto
the caliper bracket. Ensure that the caliper pin boots are not
NOTE: The leading caliper pin, or top pin, has
a bushing as part of the assembly. The trailing caliper pin, or
bottom pin, is a solid design.
- Install the new caliper pin bolts (1) and
tighten them to 70 lb ft (95 N.m).
NOTE: It is important to note which caliper pin
is designed for the correct bore. The leading caliper pin, or
top pin, has a bushing as part of the assembly. The trailing caliper
pin, or bottom pin, is a solid design. Ensure that the bolt boots
fit securely in the groove of the pin bolts. Be sure not to pinch
or tear the boots. If the boots are damaged, they must be replaced.
- Remove the wheel nuts retaining the rotor
to the hub.
- Repeat the above steps for the other side
and install both front tires and wheels.