Brake Caliper Pair in Arizona

A long descent puts the heat through the caliper

Braking on a sustained grade is continuous rather than intermittent, and the caliper is what the heat passes through on its way out of the pads. Two things suffer: the piston seal, which hardens and stops retracting the piston cleanly, and the boots, which crack and then let water in.

A caliper that drags after a mountain trip is not coincidence. It is the seal, and it will glaze a new set of pads if it is not addressed.

The climbs out of Phoenix and Tucson are long enough to matter on the way back down.

Does this state inspect your car

No Arizona safety inspection programme appears anywhere in the federal survey of every state programme between 1929 and 2015. A dragging caliper is found by whoever looks at the pads, which in practice means after one pad is gone and the other still looks new.

What goes on the roads in winter

Liquid magnesium chloride goes down ahead of a storm and a granular complex chloride of sodium, magnesium, potassium and calcium during it. Road treatment gets past the dust boot, and a piston that has corroded in its bore drags the pad against the disc for the rest of its life.

A three-year battery is normal here

A lead-acid battery has a chemical clock and heat runs it fast. Every ten degrees Celsius above ambient roughly doubles the rate of the reactions that destroy it — grid corrosion, water loss through the vents, and plate degradation.

Under a bonnet in Phoenix in July, that clock is running at several times its design rate for weeks at a time. Three years is a normal life. Four is fortunate. Five essentially does not happen unless the car lives in a garage and is driven at night.

What else Arizona does to a car

Dry heat and ultraviolet degrade everything on the outside of a part before the inside wears out.

Desert dust is fine enough to pass through anything that breathes.

What we hold, and what it costs

10 options from Cardone, Centric, Dorman, Power Stop and Raybestos, from $219.99 to $349.99. Prices are firm — where we have no price we publish none.

We are a reseller rather than a manufacturer: we source the part, check it over and sell it, and we confirm it against your year, make, model and engine before it ships rather than asserting a fit on the page. We ship anywhere in Arizona, including Phoenix, Tucson, Mesa and Chandler and Flagstaff.