# Brake Caliper Rebuilding in Upland > Keep your original calipers. Route 66 Auto Repair in Upland inspects the bore, then rebuilds with new seals, boots and parts when it makes sense. Source: https://route66autorepairshop.com/brake-services/brake-caliper-rebuilding 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:** A rebuild keeps your **original caliper body**. It only works when the **bore is smooth**, so inspection decides whether it is worth doing. Caliper rebuilding means keeping your original caliper body and renewing the parts that wear inside it: the piston seal, the dust boot and often the piston. Route 66 Auto Repair in Upland rebuilds calipers when the bore is clean and a replacement unit is hard to find, very costly, or simply not what you want on your car. ## Who should consider a caliper rebuild? - Owners of classic and older cars who want to keep matching original parts - Vehicles with multi-piston calipers, where replacement units cost a lot - Models whose replacement calipers are back-ordered or discontinued - Trucks and vans with a sound caliper body but tired seals ## Why does the bore decide everything? The bore is the smooth cylinder the piston rides in. A square-cut seal sits in a groove inside it and does two jobs: it keeps fluid in, and it pulls the piston back a hair when you release the pedal. If the bore is pitted from moisture in old fluid, a new seal cannot do either job, and the rebuilt caliper will weep or drag. So we inspect the bore before promising anything. Light staining can often be cleaned up. Pitting in the seal groove or along the piston path usually means the body should be retired, and we would quote [brake caliper replacement](https://route66autorepairshop.com/brake-services/brake-caliper-replacement) instead. We show you what we see, and your written estimate shows every step. ## What gets renewed in a rebuild? - Square-cut piston seal - Dust boot and its retaining ring - The piston, when the old one is pitted or chipped (see [caliper piston repair](https://route66autorepairshop.com/brake-services/brake-caliper-piston-repair)) - Bleeder screw and cap - Slide pin boots and bushings on floating calipers ## Our caliper rebuilding process 1. **Remove and open:** The caliper comes off and the piston is removed so the bore can be examined under good light. 2. **Decide with you:** If the bore passes, we quote the rebuild. If it fails, we quote a replacement and explain why. 3. **Rebuild:** Old seals come out, parts are cleaned, and new seals, boots and hardware go in with assembly lubricant. 4. **Refit and bleed:** The caliper goes back on, the system is bled, and the car is road-tested. ## What's included in a caliper rebuild - Bore inspection with photos - Rebuild kit with new seals and boots - Piston replacement when needed - New bleeder screw - Brake bleed - Road test ## How soon should a rebuild happen? **Need now:** - A caliper weeping fluid past its seal - A piston that will not retract **Need later:** - Cracked dust boots on a car you plan to keep - A mostly parked collector car due for a brake refresh ## Is a rebuild cheaper than a replacement caliper? Not always. Rebuild labor is higher than a bolt-on swap, so on common cars a remanufactured caliper often costs about the same or less. A rebuild wins when the replacement is rare or pricey, or when originality matters to you. We quote both whenever both are possible. Kits sometimes need ordering, and if that changes the timing we text you. AAA cardholders save 10% on parts and labor, up to $75. ## After a rebuild New seals settle in over the first stops. Glance at the inside of each wheel during the next week, and bring the car in if you see any wetness. Keeping the fluid fresh with a regular [brake fluid flush](https://route66autorepairshop.com/brake-services/brake-fluid-flush) protects the new seals and the bore you just saved. ## Frequently asked questions ### Is rebuilding smarter than buying a new caliper? On a common daily driver, usually not, because remanufactured units are easy to get. On a classic, a rare model or a large multi-piston caliper, it often is. The bore inspection makes the final call. ### How do I know you will not upsell me? We photograph the bore, quote the rebuild if the body is good, and quote a replacement only if it is not. Each estimate line says why it is there, and nothing is added without your approval. ### Do rebuilt calipers need special brake fluid? They need the fluid type your vehicle specifies, from a freshly opened container. Mixing incompatible fluid types can harm seals, so we check the reservoir cap and the manual before filling. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.