Safety: A sinking pedal or a pump that will not build pressure means reduced braking. Do not tow or drive in traffic until it is fixed.
Checks, in order
- Listen and read codesKey on, engine off: the pump should run for a few seconds and stop. A pump that cycles every two or three pedal presses is losing pressure. C1252 is the pump motor, C1253 the relay, C1256 low accumulator pressure. C1241 is low voltage and usually a battery problem, not a brake problem.easy $ · under about $50
- Battery and wheel speed sensorsWeak batteries set brake codes on these trucks, and a single wheel speed sensor or a chewed wire lights ABS and VSC without touching the pedal feel. Check both before condemning the booster.easy $ · under about $50
- Master cylinder leaking into the boosterA pedal that slowly sinks with the engine running and no external leak is the master cylinder seals bypassing internally. On this design the master cylinder and booster are serviced as an assembly.hard $$$ · shop-level job, $500+
- Replacement and bleedingOwner-reported costs run $1,500–2,000 and up for the assembly, with remanufactured units cheaper. The system needs a Techstream bleed and zero point calibration after, so plan on a shop with the tool.hard $$$ · shop-level job, $500+
Applies to: 2nd generation Tundra, 2007 to 2021, with the 5.7L 3UR-FE V8 (most trucks), the 4.6L 1UR-FE (2010–2019) and the 4.7L 2UZ-FE (2007–2009). Engine-specific items say which engine they apply to. Assumes a stock truck.
Tools and parts for these checks
Links below are Amazon affiliate links: as an Amazon Associate, toyotadata earns from qualifying purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.
| ITEM | USED FOR | BUY |
|---|---|---|
| Front brake pads | Replacing worn or glazed pads | Shop on Amazon |
| Genuine Toyota DOT 3 brake fluid | Flushing old fluid; confirm DOT 3 on your reservoir cap | Shop on Amazon |
| One-person brake bleeder kit | Bleeding air out of the lines | Shop on Amazon |
| Dial indicator with magnetic base | Measuring rotor runout | Shop on Amazon |
More 2nd Gen Tundra problems
- Burning oil smell or smoke from the engine bay after a drive, no puddle on the ground (5.7L) (Engine)
- Check engine light, VSC and 4LO flashing, truck stuck in limp mode (P0418, P2440, P2442, P2445) (Emissions)
- Ticking from the engine on cold start that fades as it warms up (Engine)
- Pink crust or a drip at the front of the engine, coolant level dropping (Cooling)
- Turn the key: one click or nothing, engine does not crank (Starting & Charging)
- Gear oil on the inside of a rear wheel or on the brake backing plate (Drivetrain)
All 10 2nd Gen Tundra symptoms in the interactive troubleshooter →
General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.