Do you ever wonder what is taking a mechanic almost an hour when your vehicle is up on the lift? Most people just hand over the keys and hope for the best. But if they’re aware of what exactly is being checked – and more importantly how it justifies whatever recommendations are made – they’re more likely to notice when they’re up on a shop’s chopping block versus getting a thorough, justifiable pass.
Fluid Levels
The first thing that’s checked is what’s floating through your car. A dipstick gets pulled to check oil levels and quality. Fresh oil is that amber color, almost translucent. Oil that has been there a while turns dark and gritty. A little bit of darkening is fine, but if it looks like black sludge, that’s an issue. The same goes for coolant (another big ticket item). An overflow tank holds coolant, which should be filled to a decent level. The color means something, too. Most coolant starts off bright green; some are orange or pinkish. Once it turns brownish or rusty, the protective additives have broken down and it’s done its job. Brake fluid is another substance checked; a small reservoir is tucked away at the back of the engine bay and it should be clear or light amber in appearance. Dark brake fluid means moisture has entered the cylinder over time and that is not good for the internal brake components. Power steering fluid gets checked as well. Transmission fluid is checkable in some makes and models as well, although with many modern vehicles having sealed systems it’s hard to verify – great in theory, but not so much if something goes wrong down the line.
Belts, Hoses, and Battery
Drive belts are rubber bands (albeit expensive ones that keep your alternator and more running). They get looked at for cracks on the ribbed side, glazing from slippage or frayed edges. Sometimes they look okay but are actually nearly spent. When belts go, you ain’t going anywhere. Similarly for hoses – they look okay from the outside, but a squeeze check from a technician can reveal if they’ve gone soft or hard and brittle. Either way, they’re on the brink of blowing or leaking. The clamps that hold hoses in place rust out and/or loosen up over time. Those are checked. Battery terminals are cleaned off from any corrosion (that crusty white or blue-green stuff) and assessed for a “load test.” It may start up fine in the moment, but if it doesn’t have sufficient “kick” to get through a cold morning or an evening out, then it’s time to let it go. A tested battery will substantiate whether its longevity will leave someone stranded.
Brake Inspection
This requires that wheels come off. No one can truly inspect brakes through the spokes without direct access to rotor – and pad – thicknesses. New pads are often ten – twelve mm thick; they need replacement at about three to four mm in most shops but they won’t turn you away at four mm unless they’re looking at your pocketbook for future business. Rotors (discs against which the pads press) are just as vital since heavy grooves or scoring means they’re eating up pads quicker than necessary. Heat cracks mean someone is riding their brakes; driving down mountains without downshifting can produce those kinds of cracks. A micrometer measures rotors since they have minimum thickness recommendations; anything below that does not handle heat properly and gets dangerous over time. Brake lines and hoses run to each respective tire; rubber hoses can look okay on the exterior but rupture on the inside restricting brake fluid flow; metal lines rust out and leak. The entire system works based upon hydraulic pressure from brake fluid so this is imperative.
Tires Tell All
Tires get measured for tread depth, obvious – but anything below three mm gets questionable, especially in inclement weather. However, wear patterns tell what’s wrong with the vehicle – worn more inside or outside edges? Alignment is off; worn through the center faster? Overinflated; worn through edges faster? Under-inflated; weird cupping? Worn out suspension components? Each tire probably tells a different story based upon which corner of the vehicle they’re on and what component there is failing.
Sidewalls get checked for bulges – otherwise known as potential blowouts – and cracks that signify age catching up with time; tires have lifespans regardless if they’ve been driven hard or just sat around idly for years on end without miles racked up. The date code signifies when tires were manufactured and over six years old extra scrutiny applies when miles seem optimal; tread isn’t everything if a tire has aged ten plus years regardless of use.
Wheels crack – or get bent – from hitting potholes along the way. This causes vibration to run through the car and makes balancing impossible. Lug nuts get assessed for tightness (too tight warp rotors/crack wheels; too loose make them fall off while driving).
Suspension and Steering Wear
This is a broad category because shocks/struts wear out slowly through daily use so drivers don’t realize how much they moan and groan until it’s too late. A bounce test means pushing each corner down hard once – it should bounce once and settle; multiple bounces mean worn shocks out for surprise appearances whenever hitting bumps. Fluid leakage from shocks means impending failure.
Ball joints connect suspension to wheels while allowing things to steer; when they wear out there’s play – so wheels will move independent of steering wheel control – and that’s not good news bears for directional usage. Tie rod ends do similar work and wear similarly as well; both have rubber boots that keep grease in/dirt out while having them secured to make sure nothing is getting compromised. If a boot wears out, dirt gets in faster than greased lubrication making everything wear faster.
Bushings connect control arms/sway bars/wear in various rubber and metal formations over time making them old; most make clunking noises – or affect handling in subtle fashions – as drivers have overcompensated thinking something was “normal” without realizing something broke down progressively over time until it’s too late. During a proper car service these components get segregated, which makes things safer and saves money on tire replacements from uneven wear.
What’s Up With the Exhaust
An exhaust visual occurs once up on the lift for positive access. Rust holes appear, especially in areas that use road salt. Small holes make cars louder but aren’t dangerous; holes toward the front where exhaust can enter the cabin are carbon monoxide concerns – potential hazards.
Catalytic converters eventually fail to work when someone maliciously tears out valuable metals; mufflers eventually rust through based on environment; hangers/brackets that hold them up/wear out/rust/disallow components from sagging/rattling.
Heat shields protect hot exhaust parts from burning other parts/causing fires; when they lose their integrity they make terrible noises that sound catastrophic, which is why many people ignore it, however it’s just a cheap fix with more bolts/clamps than anyone needs to deal with inasmuch as if they let it linger for too long making their header/coolant line extremely vulnerable (exterior components are plastic).
Electrical and Light Overview
All exterior lights should be inspected – headlights/tail lights/brake lights/turn signals/license plate lights – all sound good in theory, but brake lights are one of those lights that people never see on their own cars until it’s too late – the person behind them finally tells them with a honk after it’s almost too late to crash into them.
Headlight aim should be assessed at good shops too – headlights can get tilted from vibration or front-end work; poorly aimed headlights can potentially blind oncoming traffic. There are tolerances but plenty of shops skip them.
Filters Everyone Forgets
Air filters get inspected via easy visibility – pull them out; clean air filters from engines are white/light colors; dirty ones have stuff packed in there – whether it’s dirt or leaves – clogged ones make engines work harder/prevent good gas mileage plus they cannot protect against grit that somehow makes its way past it.
Cabin air filters are even easier to forget because they don’t impact performance – they just help improve quality of life through heating/AC – clogged ones decrease airflow through vents and allows dust/allergens in; people with allergies often notice their symptoms worse in their car without realizing the filter is the problem.
Windscreen wipers assessed because blades smear instead of clean rubber/checked for spring tension (the arm); if springs are weak then blades do not exert even pressure across glass which makes streaks even worse with new rubber because new rubber doesn’t even matter.
Inspection from Below
With a car lifted, technicians look for fluid leaks – oil/coolant/transmission fluid/differential fluid/power steering fluid – for some leaks are minor seeping leaks which are not urgent meanwhile others actively drip – others told that they “might want to think about it in a few weeks” need urgent attention immediately before someone runs out of all oil halfway down their road trip.
Damage from debris getting stuck under cars/speed bumps/cross country dangers present themselves here, too, whether it’s bent splash shields/skid plates; damaged things happen more often than people realize – a slow leak starts as a damaged oil pan – and next time it gets hit it cracks completely.
Rust occurs all over especially where frame/subframe meet in areas where they use salt on roads rather than spray glaze. Surface rust is normal; rusted holes eating through metal/rusting out structural integrity (like frames) becomes a safety concern/costly endeavor.
How It’s Documented
Better shops write everything down – increasingly note things with photos – with pictures of worn brake pads or rusty holes offers more credibility – and things can be communicated better over time by owners comparing notes between findings prior to completion every time something else pops up.
The way things are recommended gets separated by priority to outline immediate safety concerns versus “this might be something you’ll want to check on in three to six months” versus “it’s just something you should be aware of.” Not everything needs immediate priority repair – honest shops make sure of it instead of saying everything needs immediate attention.
How Long Does It Take?
A legitimate full inspection takes time. Forty-five minutes to an hour should do it if it’s good enough (and that’s without finding issues – that may mean longer since they need documenting). Shops that say they’re thorough in 10-15 minutes need better systems – they’re missing things because there are too many things to check properly in a short amount of time.
Taking the extra care up front will help smaller issues before they catastrophically fail compromising all other systems. Brake pad replacement costs $400-$500 with labor/maybe additional miles. When someone waits until their pads are gone/longevity destroys rotors/disc’s worth $1,200-$2,000 – that’s too late because that costs three times as much. Coolant will turn into blown head gaskets if leaks disappear due to overheating thousands of dollars worth of mistakes – catch belts before they snap/send someone sideways to make sure they’ve got good workability instead of worrying about tow bills because no one wants to pay for someone else’s inconvenience.
How Car Owners Educate Themselves
A better understanding of what’s involved helps everyone become better qualified car owners so they know how to separate themselves from aggressive shops versus long serving or honest establishments trying to help them instead – and helps ask somewhat educated questions without just blindly handing over keys hoping for the best after some kind of transaction after making the investment for such consideration.
