# ABS Pump Repair in Upland > ABS pump running nonstop or not at all? Route 66 Auto Repair in Upland tests the motor, relay and valves, then repairs and scan-tool bleeds. Source: https://route66autorepairshop.com/brake-services/abs-pump-repair Updated: 2026-09-17 Business: Route 66 Auto Repair, 1775 W Foothill Blvd, Upland, CA 91786, (909) 608-7699 Hours: Monday to Friday 8 AM–5 PM, Saturday 8 AM–2 PM, Sunday closed **TLDR:** The **ABS pump** is the hydraulic muscle behind anti-lock braking. Repairs finish with a **scan tool bleed** so the pedal stays firm. The ABS pump and its valve block, often called the hydraulic unit or modulator, are what actually pulse your brakes in a skid. Route 66 Auto Repair in Upland tests the pump motor, its relay and fuse, and the valves before choosing a repair. After any work on the hydraulic unit, we bleed it with a scan tool so no air stays trapped inside. ## What are the signs of an ABS pump problem? - A buzzing or whirring that keeps going after you park - A pump motor or pump relay code on the scan - A battery that is dead by morning, drained by a pump that will not shut off - No buzz at all during the short self-test after you pull away - A hard, high pedal or a sinking pedal after an anti-lock stop ## Is some ABS noise normal? Yes. Many cars run a quick self-test a few seconds after you start moving, and you may hear a brief buzz or feel a tick through the pedal. In a real anti-lock stop, the pedal pulses hard and the pump grinds loudly. Both are normal. A pump that runs on its own while you sit at a light is not. ## What sits inside the hydraulic unit? The unit holds an electric pump motor, a set of solenoid valves for each wheel circuit, and small accumulators that store fluid during a pulse. The motor gets power through a relay and a fuse, often in a fuse box beside the unit. A failed relay or a corroded motor connector is a much smaller repair than a pump, which is why we test those first. Moisture in old brake fluid is hard on these valves. Rust and debris can make a valve stick, which can cause a pull or a low pedal. That is one more reason to keep up with a [brake fluid flush](https://route66autorepairshop.com/brake-services/brake-fluid-flush). The electronic side of the same assembly is covered under [ABS module repair](https://route66autorepairshop.com/brake-services/abs-module-repair). ## Our ABS pump repair steps 1. **Command test:** Using a scan tool, we run the pump and click each valve while listening and watching data. 2. **Check the circuit:** The fuse, relay, wiring and motor ground are tested. 3. **Repair:** We fix the circuit, or replace the pump or hydraulic unit if the motor or valves have failed. 4. **Scan tool bleed:** The unit is bled by cycling its valves with the scan tool, followed by a [wheel-by-wheel bleed](https://route66autorepairshop.com/brake-services/brake-system-bleeding). ## What's included in ABS pump repair - Scan tool pump and valve command tests - Fuse, relay and wiring checks - Pump or hydraulic unit repair or replacement - Scan tool bleed plus a wheel-by-wheel bleed - Pedal feel check - Road test with an anti-lock stop where it is safe ## How urgent is a pump fault? **Need now:** - A pump that runs constantly - A pedal that changes after an anti-lock stop - Fluid leaking from the hydraulic unit **Need later:** - A pump relay code with a normal pedal, booked soon - Aging fluid noticed during testing ## How is ABS pump work priced? A relay or fuse repair is small. A pump or full hydraulic unit is a bigger job, may need parts ordered, and always needs a scan tool bleed. Some units must also be coded to the car. Phone figures are ranges until the command tests are done; your written estimate follows. AAA cardholders receive 10% off parts and labor, with the discount capped at $75. ## Frequently asked questions ### Why is there a buzzing sound right after I start driving? That is often the ABS self-test, and it is normal if it is short and happens once. A buzz that keeps going, or starts while the car is parked, is worth a check. ### Can a normal bleed get air out of the ABS unit? Not always. Air can hide in the hydraulic unit's valves. Many cars need a scan tool to cycle those valves during the bleed, which we do after any pump work. ### Can you squeeze my car in today if the pump will not stop running? Call [(909) 608-7699](tel:+19096087699) first. If the board allows, we will look the same day. If it is full, a tow-in or our after-hours key drop lets us start as soon as a bay opens. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.