Brake Caliper Slide Pins

This procedure covers cleaning, inspecting, and lubricating brake caliper slide pins to ensure proper caliper operation and even brake pad wear on 2014-2018 Chevrolet Silverado 1500 trucks with the 5.3L V8 engine.

Warnings

Tools required

Parts

• Silicone brake grease (high-temperature) × 1 — Use synthetic silicone brake lubricant rated to 400°F+
• Caliper slide pin boots (if damaged) × 1 — Inspect before ordering - replace only if torn

Fluids

• ACDelco DOT 4 Brake Fluid — 0.25 qt

Preparation

1. Park vehicle on level, solid ground and engage parking brake
2. Chock rear wheels securely if working on front brakes, or front wheels if working on rear brakes
3. Remove brake fluid reservoir cap and use turkey baster to remove approximately 1/4 of fluid to prevent overflow when compressing pistons - dispose of old fluid properly
4. Loosen wheel lug nuts 1/4 turn while vehicle is on ground
5. Lift vehicle with floor jack at manufacturer-specified lift points and support securely on jack stands rated for vehicle weight
6. Remove wheel and tire assembly completely

Procedure

1. 1

   Inspect caliper and slide pin condition
   Visually inspect the caliper for fluid leaks, cracked boots, and general condition. Check slide pin boots for tears, cracks, or deterioration. Examine the caliper bracket for corrosion. If slide pins are severely corroded or seized, the entire caliper assembly may require replacement rather than service.
2. 2

   Remove caliper slide pin bolts
   Using a 17mm socket, remove both caliper slide pin bolts that secure the caliper to the bracket. These are the upper and lower bolts that pass through the slide pins. Support the caliper with your hand as you remove the second bolt to prevent it from falling and damaging the brake hose.
3. 3

   Pivot caliper away from rotor
   Carefully pivot the caliper upward and away from the brake rotor, keeping the brake hose attached. Do not allow the caliper to hang by the brake hose. Support the caliper by hanging it from the suspension or frame using a piece of wire, bungee cord, or specialized caliper hanger. Ensure there is no tension or kinking on the brake hose.
   ⚠Never let the caliper hang by the brake hose alone - this can damage the hose internally and cause brake failure.
4. 4

   Remove slide pins from bracket
   Pull each slide pin straight out from the caliper bracket. The pins should slide out with moderate effort. If pins are seized and cannot be removed by hand, apply penetrating oil and allow to soak for 15-30 minutes. Do not use excessive force. Remove and inspect the rubber slide pin boots - they should remain on the bracket or come off with the pins.
5. 5

   Clean slide pins and bores
   Using brake parts cleaner and shop towels, thoroughly clean all old grease, dirt, and corrosion from both slide pins. Clean the slide pin bores in the caliper bracket with brake parts cleaner and a clean towel. Use a non-metallic wire brush if necessary to remove stubborn deposits. Inspect pins for scoring, pitting, or excessive wear - replace if damaged. Dry all components completely with clean shop towels.
6. 6

   Inspect and replace boots if necessary
   Carefully inspect each rubber slide pin boot for tears, cracks, brittleness, or deterioration. Even small tears allow water and dirt to enter, causing corrosion. If boots are damaged, remove old boots completely from the bracket and install new ones, ensuring they seat properly in the bracket grooves. Undamaged boots can be reused.
   ℹ️Damaged boots are a common cause of premature slide pin failure. Do not skip this inspection.
7. 7

   Apply silicone brake grease to slide pins
   Apply a thin, even coat of high-temperature silicone brake grease to the entire length of each slide pin. Do not use petroleum-based grease, anti-seize compound, or standard chassis grease - these can damage rubber components and degrade at brake system temperatures. The grease coating should be complete but not excessive.
8. 8

   Reinstall slide pins into bracket
   Insert each lubricated slide pin straight into its bore in the caliper bracket, pushing firmly until fully seated. The pin should slide in smoothly with light effort. Ensure the rubber boot properly engages both the slide pin and bracket to create a complete seal. Verify each pin moves freely in and out of the bore by approximately 1/4 inch - this confirms proper lubrication and function.
   ⚠Slide pins must move freely. Binding pins will cause uneven brake pad wear and reduced braking performance.
9. 9

   Position caliper over rotor and brake pads
   Remove the caliper from its support and carefully position it over the brake rotor and pads. If the caliper does not fit over the pads easily, the piston may need to be compressed slightly. Use a C-clamp or brake caliper piston tool to slowly compress the piston, watching the brake fluid reservoir to ensure it does not overflow. Align the caliper slide pin bolt holes with the slide pins.
10. 10

    Install and torque caliper slide pin bolts
    Apply a small amount of thread locker to the threads of each caliper slide pin bolt if specified by manufacturer (check service manual). Insert both slide pin bolts through the caliper and thread them into the slide pins by hand to prevent cross-threading. Using a torque wrench and 17mm socket, torque both caliper slide pin bolts to specification in a star pattern (alternate between upper and lower).
    ⚠Under-torqued caliper bolts can loosen and cause caliper detachment. Over-torquing can damage threads or make future service difficult.
    Torque spec

    Caliper Slide Pin Bolts35 Nm (26 lb-ft)
11. 11

    Verify caliper operation
    With the caliper fully installed, grasp it firmly and attempt to move it side to side and up and down. There should be minimal movement in the slide pins. Verify the brake hose has no kinks or twists and has adequate slack for suspension travel. Check that no tools or parts are left on or near the brake assembly.
12. 12

    Reinstall wheel and tire
    Mount the wheel onto the hub, ensuring it seats properly. Install all lug nuts by hand, threading them at least 3-4 turns to prevent cross-threading. Tighten lug nuts in a star pattern with hand tools until snug but not fully torqued.
13. 13

    Lower vehicle and perform final torque
    Lower the vehicle from jack stands using the floor jack until the tire contacts the ground with partial weight. Remove jack stands, then lower vehicle completely. Using a torque wrench, torque all wheel lug nuts to specification in a star pattern (opposing nuts in sequence).
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)
14. 14

    Restore brake fluid level and pump brakes
    Check brake fluid level in reservoir and top off to the MAX line with fresh DOT 4 brake fluid if needed. Reinstall reservoir cap. Before moving the vehicle, pump the brake pedal slowly several times until it feels firm and builds normal pressure. The pedal should not go to the floor.
    ⚠️Do not attempt to move the vehicle until the brake pedal feels firm. A soft pedal indicates air in the system or another problem requiring immediate attention.

Reassembly

1. Repeat the entire procedure for the opposite side caliper on the same axle to ensure even brake performance
2. After servicing all calipers, perform a visual inspection of all work before test driving
3. Dispose of old brake fluid and contaminated shop towels according to local environmental regulations

Verification

• With vehicle still in park or neutral, pump brake pedal 10-15 times - pedal should feel firm and consistent, not spongy
• Check brake fluid reservoir - level should be at MAX line with no leaks visible around cap
• Perform a low-speed test drive in a safe area - brakes should engage smoothly without pulling to one side
• After test drive, verify no brake fluid leaks at calipers or hoses, and check that wheels are not excessively hot (slight warmth is normal)
• Perform several moderate brake applications from 30-40 mph to verify proper function before returning to normal driving
• Re-torque wheel lug nuts after 50-100 miles of driving to ensure they remain properly seated

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