ASE A5 drum brakes, small area, long task list

Incorrect: Disconnecting the battery protects electronics during electrical work; it does nothing against solvent splash or fumes.

Incorrect: Many brake cleaners are flammable, so spraying hot parts adds a fire risk; parts should be cool.

Incorrect: Running the engine adds exhaust and an ignition source and does nothing against solvent splash.

Correct: Aerosol brake cleaner splashes and rebounds off parts, so gloves and eye protection are what keep it off the technician's skin and eyes.

Incorrect: Compressed air blows brake dust and solvent mist into the air; parts are left to air-dry instead.

Correct: With the adjusters seized, shoe-to-drum clearance grows as the linings wear, so the pedal travels farther before the shoes touch the drums.

Incorrect: Pedal pulsation comes from an out-of-round drum or rotor variation, not from loose shoe clearance.

Incorrect: A pull to one side during braking needs unequal braking side to side, but with both rear adjusters out the clearance grows evenly, so the vehicle does not pull.

Incorrect: Grinding means linings worn to metal or debris in the drum; a failed adjuster does not grind by itself.

Incorrect: New shoes do not require new drums; a drum within its diameter limit is measured and machined if needed.

Correct: A drum is replaced when the cut needed to clean it up would leave it larger than the maximum diameter cast or stamped on it; past that it is too thin to absorb heat.

Incorrect: Drums are judged by measurement, not by a mileage interval.

Incorrect: Light scoring is exactly what machining removes, as long as the drum stays within its diameter limit.

Incorrect: Incorrect shoes would show up as a fit or braking problem, not mainly as long parking brake lever travel.

Incorrect: Strong return springs pull the shoes back firmly but do not add enough clearance to explain long lever travel.

Incorrect: Cables are adjusted only after the service shoes are set; adjusting stretched cables first would hide the real problem and can make the brakes drag later.

Correct: The adjusters are backed off to fit the drums over new linings, so until the shoes are adjusted out, the parking brake lever has to take up that extra clearance.

Incorrect: Mounting bolts hold the cylinder to the backing plate and have nothing to do with fluid passing the cups.

Incorrect: New cups in a worn or pitted bore soon leak again; replacing only the cups ignores the bore condition.

Correct: Fluid past the pistons means the cups are failing in a bore that is usually pitted or worn too, so a new wheel cylinder is the reliable repair, followed by bleeding.

Incorrect: Greasing the boots does not seal hydraulic fluid; it only hides the leak and can contaminate the linings.

Correct: An out-of-round drum pushes the shoes in and out each turn, and that pressure pulse reaches the pedal.

Incorrect: Glazed brake shoes reduce friction and can squeal, but they do not change the drum's shape.

Incorrect: Too much shoe clearance lowers the pedal and too little causes drag; neither pulses.

Incorrect: A sticking wheel cylinder causes pull or drag at that wheel, not a rhythmic pulse.

Incorrect: The stamped part number on a backing plate tells nothing about its condition, and the plate stays on the vehicle during a shoe job.

Incorrect: Plate thickness is not a service measurement on a backing plate; the wear that matters is at the raised pads the shoes rest on.

Incorrect: Paint condition is cosmetic; it does not affect braking unless rust builds up where the shoes touch the plate.

Correct: The shoe contact points (raised pads on the backing plate) wear grooves that make the shoes hang up and squeak, so they are inspected, smoothed if needed and lubricated.

Incorrect: Rusted hold-down hardware can bind the shoes, but rust is not a liquid that soaks into the lining.

Correct: Brake fluid seeping past wheel cylinder cups soaks into the linings, and contaminated linings must be replaced after the leak is fixed.

Incorrect: Worn ledges cause noise and shoe hang-up, not lining contamination.

Incorrect: Brake dust is worn lining material; it is cleaned out for safety but does not soak the shoes like fluid or grease.

Incorrect: Applying the parking brake moves the shoes and loads the cable, which gives a false adjustment; it stays released.

Incorrect: A locked wheel means the shoes are jammed against the drum; left there, the brakes drag and overheat.

Incorrect: Leaving the shoes at drag makes the brake rub constantly, heat the drum and wear the linings early.

Correct: Bringing the shoes out to light drag and backing off slightly sets minimum clearance without leaving them rubbing the drum.

Incorrect: One deep cut overloads the bit and leaves a rough, chattered finish; a rough cut is followed by a light finish cut.

Correct: A silencer (damper) band wrapped around the drum stops it ringing under the bit; without it the cut leaves chatter marks that cause noise.

Incorrect: Scoring that cannot be removed within the maximum diameter means the drum is replaced, not machined further.

Incorrect: The finish cut uses a slow feed; a fast feed leaves a coarse, grooved surface.

Correct: A bent backing plate or its lip touching the drum scrapes on every turn whether the brakes are applied or not, so the sound tracks road speed.

Incorrect: A leaking wheel cylinder soaks the linings and weakens braking, but it makes no scraping sound.

Incorrect: Rivets scrape the drum only when the shoes are applied; with the brakes released they do not touch.

Incorrect: A loose hold-down spring lets a shoe rattle over bumps; it does not make a steady scrape tied to wheel speed.

Incorrect: Pushing the shoes out against the drum is the wheel cylinder's job.

Incorrect: Pulling the shoes back after each stop is the job of the return springs.

Correct: Hold-down springs and anti-rattle clips keep the shoes flat against the backing plate pads while letting them slide out and back, which stops rattle and uneven contact.

Incorrect: The star wheel is held by the adjuster lever and its spring, not by the hold-downs.