This procedure covers cleaning, inspecting, and lubricating brake caliper slide pins to ensure proper caliper movement and even brake pad wear on the 2016-2024 Hyundai Tucson 2.5L AWD.

Warnings

Tools required

Parts

• Silicone brake grease (high-temp synthetic) × 1 — Use synthetic silicone brake lubricant rated for slide pins
• Brake cleaner spray × 1 — Non-chlorinated brake parts cleaner

Preparation

1. Park vehicle on level surface and engage parking brake
2. Place wheel chocks behind rear wheels if working on front, or front wheels if working on rear
3. Loosen wheel lug nuts 1/4 turn while vehicle is on ground
4. Lift vehicle with floor jack at manufacturer-designated jacking points
5. Support vehicle securely on jack stands - NEVER work under a vehicle supported only by a jack
6. Remove wheel completely and set aside
7. Verify brake fluid reservoir cap is secure (prevents overflow when compressing pistons)

Procedure

1. 1

   Remove caliper slide pin bolts
   Locate the two caliper slide pin bolts on the rear of the caliper assembly (facing toward center of vehicle). Using a 17mm socket, remove both upper and lower caliper slide pin bolts. Keep these bolts as they will be reused. Note the orientation of the caliper for reassembly.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
2. 2

   Pivot caliper upward
   Carefully pivot the caliper body upward and away from the brake rotor. The caliper will remain attached via the brake hose - do NOT disconnect the brake hose or allow the caliper to hang by the hose. Support the caliper by resting it on the suspension component or securing it with a wire hook or bungee cord to the strut/shock.
   ⚠Never let the caliper hang by the brake hose - this can damage the hose internally and cause brake failure.
3. 3

   Inspect brake pads and hardware
   With the caliper raised, visually inspect brake pad thickness (minimum 3mm), rotor condition (no deep grooves or hot spots), and anti-rattle clips. Note any wear for future service. If pads are contaminated with grease or oil, they must be replaced - do not continue this procedure.
   ⚠If you observe brake fluid leaking from caliper or hose, stop immediately and address the leak before continuing.
4. 4

   Remove slide pins from bracket
   Locate the slide pin boots on the caliper bracket (the stationary mount attached to the steering knuckle). Pull back the rubber dust boots and fully remove both slide pins from the bracket. The pins should slide out easily - if they are seized, note this for possible bracket replacement. Inspect the rubber boots for tears, cracks, or deterioration.
   ℹ️Damaged dust boots must be replaced. Torn boots allow water and debris to contaminate the slide pins, causing seizure.
5. 5

   Clean slide pins and bores
   Spray brake cleaner on each slide pin and wipe thoroughly with a clean lint-free rag to remove all old grease and contamination. Spray brake cleaner into the slide pin bores in the bracket and wipe clean. Use a wire brush if necessary to remove corrosion from the bracket bores, then clean again with brake cleaner. All surfaces must be completely clean and dry before lubrication.
   ⚠Ensure brake cleaner fully evaporates before applying lubricant. Brake cleaner residue will contaminate the new grease.
6. 6

   Inspect slide pin condition
   Examine each slide pin for scoring, pitting, corrosion, or wear. The pins should be smooth and chrome-plated. Check that the dust boots are flexible and free of cracks. If pins show corrosion or pitting, or boots are damaged, replacement is required. Minor surface rust can be cleaned with fine steel wool and brake cleaner.
   ℹ️Worn or corroded slide pins will cause uneven pad wear and reduced braking performance. Replace if condition is questionable.
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 shaft. Use only enough grease to create a light film - excess grease will attract dirt and contaminate the boots. Do NOT use petroleum-based grease, anti-seize, or standard lithium grease as these will damage rubber components and cause pin seizure.
   ⚠️CRITICAL: Only use synthetic silicone brake grease specifically designed for caliper slide pins. Other lubricants will cause rubber deterioration and brake failure.
   Torque spec

   Caliper Slide Pin Bolts35 Nm (26 lb-ft)
8. 8

   Reinstall slide pins
   Insert each lubricated slide pin back into its bore in the caliper bracket, ensuring it slides smoothly without binding. The pin should move freely in and out with light finger pressure. Seat the rubber dust boots properly over both the pin and bracket to seal out contaminants. Verify boots are not twisted or pinched.
   ⚠If pins do not slide freely after cleaning and lubrication, the bracket bores may be corroded and require bracket replacement.
9. 9

   Compress caliper piston
   Before repositioning the caliper over the brake pads, the caliper piston(s) must be compressed to accommodate the brake pads. Use a C-clamp or brake caliper piston tool to slowly compress the piston(s) flush with the caliper bore. Watch the brake fluid reservoir - it may rise slightly. If reservoir is at MAX line, remove some fluid with a turkey baster before compressing to prevent overflow.
   ℹ️Some rear calipers on Tucson models may have screw-in pistons requiring a special tool to rotate while compressing. Verify your specific caliper type before proceeding.
10. 10

    Reposition caliper and install slide pin bolts
    Lower the caliper back into position over the brake pads and rotor. Align the caliper mounting holes with the slide pins. Apply a small amount of silicone brake grease to the slide pin bolt threads. Thread both slide pin bolts by hand first to prevent cross-threading, then tighten using a torque wrench to exactly 35.0 Nm (26 lb-ft) in a crisscross pattern.
    ⚠️CRITICAL TORQUE SPECIFICATION: Under-torquing can allow the caliper to loosen during braking. Over-torquing can strip threads or crack the caliper. Use a calibrated torque wrench.
    Torque spec

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

    Verify caliper movement
    With slide pin bolts torqued, grasp the caliper body and verify it can pivot smoothly on the slide pins with moderate hand pressure. The caliper should move freely without binding or excessive play. This confirms proper slide pin lubrication and function.
    ⚠If caliper does not move freely, do not operate vehicle. Re-inspect slide pins and lubrication.
12. 12

    Reinstall wheel
    Clean the wheel hub surface and wheel mounting surface of any rust or debris. Mount the wheel and thread all lug nuts by hand. Using a torque wrench, tighten lug nuts in a star pattern to 140.0 Nm (103 lb-ft). Do not use an impact wrench for final torque.
    ⚠️CRITICAL: Improper lug nut torque can cause wheel separation while driving. Always use a torque wrench and star pattern.
    Torque spec

    Wheel Lug Nuts140 Nm (103 lb-ft)

Reassembly

1. Repeat entire procedure for opposite wheel on same axle for balanced brake performance
2. For complete brake maintenance, perform on all four wheels
3. Lower vehicle from jack stands and remove stands before lowering jack completely
4. With vehicle on ground, re-torque all lug nuts to specification in star pattern to verify proper seating
5. Do NOT drive vehicle until brake pedal verification is complete (see below)

Verification

• CRITICAL: Before moving vehicle, pump brake pedal several times until pedal feels firm and returns to normal height - this reseats the caliper pistons against the pads
• Check brake fluid reservoir level and top off to MAX line with DOT 4 brake fluid if needed after piston compression
• Start engine and verify brake pedal is firm with engine running - pedal should not sink to floor
• Perform a low-speed brake test (under 10 mph) in a safe area to confirm normal braking function before road use
• Test drive at moderate speeds and verify even braking with no pulling to either side
• After 50-100 miles, re-check lug nut torque with torque wrench
• Listen for any unusual brake noise (squealing, grinding) which may indicate improper reassembly or worn components
• Monitor brake performance over the next several days - if pedal feel changes or braking becomes uneven, re-inspect immediately

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