# Tire Repair in Upland: Finding and Fixing the Leak > Slow leak or nail in the tread? Route 66 Auto Repair in Upland finds the leak, repairs it from inside when it is safe, and says when it is not. Source: https://route66autorepairshop.com/tire-services/tire-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:** A slow leak has **more than one possible source**. We find it with a **water test**, repair punctures from inside, and fix bead or valve leaks at the wheel. A tire that needs air every few days has a leak somewhere, and it is not always a nail. Route 66 Auto Repair in Upland tracks down the source, whether it is a puncture, a valve stem, a bent rim edge or corrosion where the tire meets the wheel. Then we fix it the right way, or tell you plainly when the tire cannot be saved. ## Where do slow tire leaks come from? - A nail, screw or staple in the tread, common near construction zones. - A cracked rubber valve stem or a loose valve core. - Bead leaks, where aluminum corrosion under the tire edge breaks the seal to the rim. - A bent rim lip from a pothole or curb that lets air seep out at one spot. - A leaking TPMS sensor seal or nut on cars with direct pressure sensors. - A porous or cracked tire that is simply at the end of its life. ## How do we find a leak you cannot see? We inflate the tire, remove the wheel and lower it into a water tank or spray it with soapy solution. Bubbles mark the spot, and we check the tread, sidewall, bead, valve and rim edge in turn. Sometimes two leaks show up, which explains why a patched tire kept losing air. Once the source is found, the fix follows it. A tread puncture gets the inside repair described on our [flat tire patching](https://route66autorepairshop.com/tire-services/flat-tire-patching) page. A bead leak means demounting the tire, cleaning the rim seat of corrosion and resealing. A valve leak gets a new stem or core, covered on [valve stem replacement](https://route66autorepairshop.com/tire-services/tire-valve-stem-replacement). A bent lip may need [rim repair](https://route66autorepairshop.com/tire-services/rim-repair) or a new wheel. ## Our tire repair process 1. **Pressure and history:** We ask how fast the tire loses air and check pressure on all four so we can compare. 2. **Water test:** The wheel is dunked or sprayed to locate every leak point, and we photograph what we find. 3. **Repair decision:** We explain whether the source is repairable and write it on the estimate before any work. 4. **Fix and verify:** After the repair, the wheel goes back in the tank to confirm no bubbles, then is balanced and torqued. ## What's included in a tire repair - Leak test of tread, sidewall, bead, valve and rim edge - Inside inspection when the tire comes off the rim - Repair suited to the source: patch, bead reseal or stem - Second water test to confirm the leak is gone - Rebalance and lug nut torque to spec - Pressure set to your door placard ## Is your leak a need-now or need-later repair? **Need now:** - Air loss you can hear or that empties the tire in hours - Any object in the sidewall or shoulder - A tire that was driven while nearly flat **Need later:** - A loss of a few psi over a week, with no visible damage - A tire that only reads low on cold mornings ## How pricing and timing work A straightforward puncture costs less than a bead reseal, and a leaking TPMS sensor adds parts. We quote a range by phone and confirm the price on the written estimate after the water test. AAA members get 10% off parts and labor, up to $75. Most leak repairs are done the same day when the board allows. If the tire cannot be repaired, the estimate shows replacement options instead. ## Frequently asked questions ### Why does my tire keep losing air with no nail in it? Bead corrosion and valve stem leaks are the usual reasons. Aluminum wheels corrode where the tire seals, and old rubber stems crack. A water test shows exactly where the air escapes. ### Is a tire sealant from a can a real fix? It can get you off the shoulder, but it is not a repair. Tell us if you used one, since some sealants coat TPMS sensors and must be cleaned out. ### Can you repair a tire that has already been plugged? Often yes, if the plug is in the repairable tread area. We remove the tire, inspect the inside, and replace the outside plug with a proper inside repair when the damage allows. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.