Pre-Drive Check on a Borrowed Car

1. Sinking brake pedal - do not drive. A pedal that sinks under steady pressure means fluid is escaping somewhere: a leaking line, caliper, wheel cylinder, or a failing master cylinder. This is a single-point failure that ends in no brakes at all, and it can progress from "sinks slowly" to "goes to the floor" in one hard stop. Nothing else on the list matters until this is repaired and the system is properly bled by someone who can also find the leak.

2. Dark right taillight at night - do not drive tonight. You would be operating after dark with a non-functioning rear lamp: an equipment violation, and more importantly a following driver's only cue about your position and braking. Fix the bulb, or do not make this trip after dark.

3. Left rear at 22 psi against a 35 psi spec - correct before driving. That is 13 psi low, roughly a third under spec. Underinflation generates heat, degrades cornering and braking balance, and is a common precursor to a blowout at speed. Inflate cold to the door-jamb number, not the number molded on the tire sidewall, then recheck for a slow leak.

4. ABS light - drive with caution, if everything else were sound. An ABS fault normally means anti-lock is disabled while conventional hydraulic braking remains. That is a genuine degradation on wet pavement, but it is not by itself a reason to refuse the car. Here it is moot, because item 1 outranks it.

Right: an ABS warning lamp usually does indicate that the anti-lock function is disabled, and base hydraulic braking normally continues to work. Many cars are driven for years with an illuminated ABS lamp.

Missing, in order of importance:

1. The pedal test is a separate finding. A sinking pedal is a hydraulic-integrity problem that exists with or without ABS. It is the disqualifying observation, and it is not explained by an ABS lamp.
2. ABS lamps do not always mean "ABS only." On some vehicles the same lamp accompanies a fault that also affects electronic brake distribution or stability control, which changes how the car behaves in a panic stop.
3. "Needs bleeding" is a diagnosis, not a repair. Bleeding removes air. It does not fix a leak, and if fluid is escaping, bleeding temporarily restores a pedal that will sink again.

Reframe it: you are not refusing the car because of the ABS light. You are refusing it because the brake pedal will not hold pressure, and the ABS light is the least of the four problems.

With a firm pedal, the car is drivable, but the plan changes:

• Inflate first. Set the left rear to the 35 psi on the door jamb while the tire is cold, then recheck after a short drive and again the next morning. A tire that loses pressure repeatedly has a puncture or a bad valve and comes off the car.
• Test the brakes before you need them. At low speed in an empty lot, make one firm stop and feel for pull, noise, or a long pedal. Notice the difference; without ABS a hard stop will not pulse and the wheels can lock.
• Add following distance and reduce speed, especially on wet pavement, where the missing anti-lock matters most. Leave a bigger gap than usual and brake earlier and more gently.
• Fix the ABS when practical, and treat the lamp as a standing reminder that the car's margin in a panic stop is smaller than it looks.

The principle: a warning lamp is a degradation you compensate for, while a firm pedal is a pass-fail test you do not negotiate with.