2008-2014 Cadillac CTS Brake Job Guide: Symptoms, Costs and the Right Parts

By Core Brake Parts Tech Team — Circleville, OH warehouse

A brake job on a 2008-2014 Cadillac CTS is a four-wheel disc brake service: pads and usually rotors on the front axle, with the rear axle following later. The two things that trip people up on this car are the brake package (standard duty or heavy duty, which use different rotors and pads) and the parking brake, which is either a foot pedal or an electric switch depending on the car. Get those two right and this is a very manageable job.

How the CTS brake system works

GM's 2010 CTS owner manual states plainly that the car has disc brakes, and the pads carry built-in wear indicators. The system is hydraulic with vacuum power assist, and the master cylinder reservoir is filled with DOT 3 brake fluid, as marked on the reservoir cap. The manual also notes that the brakes adjust themselves for wear every time they are applied, so there is no manual adjustment to perform after new parts go on.

The CTS of this generation was built with more than one brake package. Replacement parts are listed separately for the standard duty package (brake code JE5) and the heavy duty package (brake code J55), and the two do not interchange. The CTS-V is a separate performance model with its own Brembo system and its own parts. Before you order anything, check the RPO code label (usually in the glove box or on the door jamb) for JE5 or J55, or have the parts matched by VIN.

Symptoms that your CTS is due for brakes

• A high-pitched squeal while driving. The owner manual describes the wear indicator sound as one that can come and go, or be heard the whole time the car is moving, and that stops when you press the pedal firmly. GM's warning is direct: when you hear it, the brakes will soon not work well, so have them serviced.
• Grinding or scraping. That usually means the pad friction material is gone and metal is contacting the rotor. At that point the rotors are almost always being replaced too.
• Pulsation in the pedal or steering wheel. Usually rotor thickness variation. GM notes that properly torqued wheel nuts help prevent brake pulsation, so an unevenly tightened wheel after a tire rotation can be the cause as much as a worn rotor.
• A pedal that sinks or does not return to height. The manual says a rapid increase in pedal travel is a sign brake service may be needed. That points to the hydraulic side (fluid, hoses, calipers, master cylinder), not just pads.
• A low fluid level or the BRAKE warning light. Fluid drops slowly as pads wear. A sudden drop means a leak. GM says not to top off the reservoir to cover a low level, because adding fluid does not fix a leak, and a reservoir topped off over worn pads will overflow once new, thicker pads push the caliper pistons back.

Light squeal on the first few stops of a damp morning is normal. The manual itself says some conditions and climates cause squeal on first or light application without anything being wrong.

Front vs rear: what wears and in what order

The front brakes do most of the stopping work on any car, so on a CTS the front pads and rotors are normally the first job. The rears last longer, but they do wear out, and on this car the rear job has one extra step to plan for.

Front brake job. Remove the wheel, the caliper, and the caliper bracket, hang the caliper so it does not stretch the brake hose, replace the rotor and pads, clean and lubricate the bracket slide points, and reassemble. The 1A Auto tool list for the 2008-2014 CTS front brakes calls for 14mm, 18mm and 22mm sockets, a torque wrench, a caliper hanger, a wire brush, brake grease, anti-seize and a dual-piston caliper compressor. Torque the caliper and bracket bolts to the values in the factory service manual; do not guess them.

Rear brake job. The pad and rotor work is similar, but check which parking brake your car has first. On cars with the manual foot-pedal parking brake, the parking brake is a separate mechanism, and it must be fully released before the rotor comes off. On cars with the electric parking brake (a switch in the center console), the owner manual explains that the EPB replaces the pedal and release handle and can be applied even with the ignition off. That means the rear brake can be applied by a motor, and it must be placed in its service position before you try to push the piston back. Forcing it can damage the caliper. If you do not have a scan tool that can do this, follow the service manual procedure for your car.

What to replace at the same time

• Pads in complete axle sets. GM says brake linings should always be replaced as complete axle sets. Never do one side only.
• Rotors. If the rotors are grooved, below the minimum thickness stamped on the rotor, or causing pulsation, replace them with the pads. Pads and rotors bought together as a matched kit take the guesswork out of fitment. See our brake rotors and brake pads.
• Hardware. New abutment clips and anti-rattle hardware help the new pads slide freely and stay quiet. A brake hardware kit costs little and is worth doing every time.
• Calipers, only if needed. A stuck slide pin, a torn boot or a piston that will not retract is a reason to replace a caliper. Otherwise the original calipers can be reused. Replacement brake calipers are the fix for a caliper that drags or leaks.
• Fluid. Refill and bleed with new DOT 3 from a sealed container if the system was opened. The manual warns that the wrong fluid can keep the brakes from working well, and GM says never to use silicone or DOT 5 fluid.

GM's owner manual also makes a point that matters when shopping: pads that are wrong for the vehicle can change the balance between the front and rear brakes for the worse. Buy pads made for the CTS and the correct brake package, not a close fit.

What drives the cost of a CTS brake job

The price of a brake job on this car comes down to a few choices:

• Pads only or pads and rotors. Pads alone are the cheapest job, but only if the rotors are smooth and within spec. Worn or warped rotors turn it into a pads-and-rotors job.
• One axle or both. Most owners do the front first. Doing both axles at once costs more that day but saves a second visit.
• Brake package. Heavy duty (J55) parts are larger than standard duty (JE5) parts, and the price follows.
• Labor. A shop charges labor per axle. The rear on an EPB car can take longer because the caliper has to be put in service mode. Doing it yourself removes labor from the bill.
• Extras. A seized caliper, a damaged hose or a fluid flush adds parts and time.

How hard is the job, and one recall to check

For someone who has done brakes before, the front is a straightforward bolt-off, bolt-on job with common hand tools, a torque wrench and a caliper compressor. The rear is harder only if the car has the electric parking brake. Finish every job by torquing the wheel nuts evenly in a star pattern to 190 N-m (140 lb ft), then bed the pads in with several moderate stops before any hard braking.

While you are at it, run your VIN through the NHTSA recall lookup. NHTSA campaign 11V536000 covers certain 2012 CTS vehicles built October 21 through October 26, 2011, where the vacuum brake booster pushrod retention nut may not have been torqued properly and could loosen, letting the pushrod separate from the brake pedal. Dealers inspect and correct it free of charge. It is unrelated to pads and rotors, but it is the kind of brake item worth confirming is done. If the booster itself is failing (a hard pedal, a hissing sound), see our brake boosters.

Frequently Asked Questions

How do I know if my CTS has standard or heavy duty brakes?

Check the RPO code label for JE5 (standard duty) or J55 (heavy duty), or have the parts matched by VIN. The two packages use different rotors and pads, and they are not interchangeable.

What brake fluid does a 2008-2014 CTS use?

DOT 3 brake fluid from a sealed container, per the owner manual and the reservoir cap. Never use silicone or DOT 5 fluid.

Do I need a scan tool to do the rear brakes?

Only if the car has the electric parking brake and the service procedure calls for it. EPB rear brakes have to be put into a service position before the piston can be retracted. Cars with the foot-pedal parking brake do not need one.

Should I replace rotors every time I replace pads?

Not always. If the rotors are smooth, above minimum thickness and do not cause pulsation, new pads alone are fine. Most CTS brake jobs where the pads went to the wear indicator or past it end up needing rotors too.

Why do my new brakes squeal a little on cold mornings?

GM notes that some conditions and climates cause squeal on first or light application without a fault. A constant high-pitched squeal while driving is different: that is the wear indicator.

What is the wheel nut torque on a CTS?

The 2010 CTS owner manual lists 190 N-m (140 lb ft). Tighten evenly in a star pattern.

Sources

1. 2010 Cadillac CTS/CTS-V Owner Manual (GM) - disc brakes, audible wear indicators, axle-set replacement, DOT 3 fluid, electric vs manual parking brake, 190 N-m wheel nut torque
2. NHTSA recalls, 2012 Cadillac CTS - campaign 11V536000, brake booster pushrod retention nut
3. NHTSA recalls, 2010 Cadillac CTS - recall listing for the 2010 model year
4. 1A Auto: How to Replace Front Brakes 2008-14 Cadillac CTS - tool and socket list, JE5 standard duty brake code