Free Brake Inspection: Is it Accurate?

Can You Trust the Results Of A Free Brake Inspection?

Regular brake inspections are essential to catch wear and tear early, preventing more serious and costly issues down the line. Many automotive shops and dealerships offer free brake inspections as a way to attract customers and promote their services. But this raises an important question: Are the results of a free brake inspection truly accurate and reliable? In many cases, the answer is no! This article explores how many free brake inspections are cursory and don’t disassemble the brakes to check for critical failures, meaning you can’t really trust the results of a free brake inspection.

Most free brake inspections are just a cursory overview

A full brake inspection takes time because the technician must remove all four wheels, calipers, and pads and inspect all the components for wear. Most free brake inspections are just a quick glance at the thickness of the outboard brake pad, and they don’t include a measure of the inboard pad or inboard inspection of the rotor. In addition, free brake inspections rarely check for the condition of the caliper dust boot or piston, let alone the condition of the abutment.

Measuring the thickness of the outboard brake pad is not a valid brake inspection

When shops offer a free brake inspection, they usually measure the thickness of the outboard brake pad, often without removing the wheel. That tells you the thickness of the outboard pad, but doesn’t tell you anything about the thickness of the inboard brake pad or the actual condition of the brake pads.\

Here’s why you can’t judge brake pad condition by measuring just the outboard brake pad thickness

1) The inboard and outboard brake pads wear at different rates. Even with a properly operating caliper, the inboard brake pad always wears slightly more (2-3mm) faster than the outboard brake pad.
2) The inboard pad tends to run slightly hotter than the outboard pad due to less airflow
3) If the caliper slide pins are sticking and the caliper isn’t releasing properly, the inboard pad can have significantly more wear than the outboard brake pad

Viewing brake pads through the caliper inspection window is not a valid inspection

Even if you can see both the inboard and outboard brake pad thickness through the inspection window, that doesn’t tell you the condition of the brake pad, so it’s not a valid brake inspection.

Inspecting brake pads though the caliper window only tells you the thickness of the brake pads, not their condition

A window brake inspection would have missed the serious grooving on this brake pad

Inspecting the outboard brake pad can miss serious problems on the inboard pad

Here’s an example of what you can miss by inspecting only the outboard brake pad.

A quick inspection and measurement of the outboard brake pad would have missed the fact that the inboard brake pad has delaminated and half of it has broken of

This caliper is seized, causing the inboard pad to overheat. The high heat caused the brake pad friction material to de-bond from the backing plate and crack off.

What A Paid Brake Inspection Should Include

Before delving into the accuracy of free brake inspections, it’s important to understand what what should be inspected in a paid brake inspection.

1) Wheel, Caliper, and Pad Removal To Conduct A Full Visual Inspection

You can’t properly evaluate the condition of a brake system with the wheels still on the vehicle or the caliper still connected to the bracket. The technician must have full access to the inner and outer brake pads, caliper slide pins, piston boot, and dust seal, and abutment areas.

2) Pad thickness and condition

The technician must measure the inboard and outboard pad thickness and examine the brake pad for signs of delamination, glazing, cracking, and rust.

3) Rotor thickness and condition

The technician must have access to both sides of the brake rotor to assess grooving, rust, thickness, and vent corrosion.

4) Caliper slide pin condition

The technician must assess the caliper slide pins for signs of corrosion, binding, seizing, and boot damage.

5) Caliper piston seal and piston condition

The technician must remove the caliper to inspect for signs of tears in the caliper piston dust seal and if damage is found, assess any possible corrosion on the caliper piston

6) Abutment wear

The caliper and pads must be removed to assess abutement rust and wear.

7) Brake Fluid Check

The technician should test the brake fluid for moisture content, pH balance and the presence of copper in the fluid. Color is not an indication of brake fluid condition.

8) Brake Line Inspection

The technician should check the condition of the flexible brake lines at each wheel, along with a check of all solid lines.

©, 2023 Rick Muscoplat