2006-2018 BMW 335i Brake Job Tools and Torque Specs

By Core Brake Parts Tech Team — Circleville, OH warehouse

A brake job on a 2006-2018 BMW 335i needs a torque wrench, hex and Torx bits, a piston compressor, new pad wear sensors and the right rotor size for your car, because the E90/E92/E93 and the later F30 use different discs and pads. Brembo's catalogue lists a 120 Nm tightening torque for the E92 335i's front and rear discs; caliper and carrier bolts should be torqued to the factory service manual value for your exact chassis, never by feel.

Below is what each generation uses, the tools to have on the bench before the car goes up, how to sequence the job, and where owners most often get it wrong.

Which 335i do you have? E9x vs F30 brake hardware

The 335i name covers two very different cars. The E90 sedan, E92 coupe and E93 convertible carried the twin-turbo N54 and later the N55 six. The F30 sedan replaced the E90, and the F30 335i and 335i xDrive used a new brake package with optional M Sport and M Performance brakes. Parts do not cross over between the two generations, and on the F30 they do not even cross over between brake packages.

Figures are from Brembo's application catalogue for the E92 335i and the F30 335i xDrive. Two things stand out. First, the E9x wear sensors changed in March 2010, so a 2008 car and a 2011 car take different sensors even though the pads look alike. Second, the F30's M Sport package (blue calipers) uses larger 370 mm front and 345 mm rear discs with different pads, so measure the rotor or check the caliper color before ordering anything.

The tool list

• Torque wrench covering both the low guide-bolt range and the higher wheel-bolt range. This is the one tool you cannot skip on these cars.
• Hex (Allen) bit sockets for the caliper guide bolts, which sit behind rubber dust caps on the back of the caliper.
• Torx bit sockets for the caliper carrier bolts, and a matching bit for the small rotor retaining screw that holds the disc to the hub.
• Caliper piston compressor or a large C-clamp with an old pad as a buffer. The 335i's rear pistons push straight back, because the parking brake is a separate set of small shoes inside the rear rotor hat rather than a screw-in piston.
• Flat screwdriver to unhook the anti-rattle spring clip from the caliper.
• Wire brush and brake cleaner for the hub face and carrier abutments.
• Brake lube and anti-seize: lube on the pad backing and contact points only, a thin film of anti-seize on the hub face.
• Jack, jack stands and wheel chocks, plus a wheel-hanging pin if you work alone, since BMW wheels hang on bolts rather than studs.
• Brake bleeder and fresh brake fluid of the type your owner's manual specifies.

Torque specs: what we can confirm and what to look up

Brembo's catalogue lists a 120 Nm tightening torque against both the front and rear discs for the E92 335i. That is the clamping torque the disc sees through the wheel bolts, which is why it appears on a rotor listing. Brembo's F30 335i page does not list a torque, so confirm the wheel bolt value for an F30 in the owner's manual or the service information for your VIN.

For the caliper guide bolts and the carrier (bracket) bolts, use the value in the BMW factory service manual for your exact car. We do not print a number here because published figures vary between chassis and bolt types, and a guessed number on a carrier bolt is how threads get stripped or bolts snapped. Power Stop's installation guide gives the same instruction: torque the bracket and caliper bolts to the manufacturer's specification, then lower the car and tighten the wheel fasteners in sequence to the specified torque.

Two practical rules apply no matter the number. Clean the threads before reinstalling so the wrench reading is real, and never run carrier bolts in with an impact gun.

Doing the job in the right order

1. Check the brake fluid level first. Power Stop advises the reservoir be about half full before you push pistons back, or it can overflow.
2. Lift the car, support it on stands and remove the wheel.
3. Unplug the wear sensor from the inner pad and its harness connector, and pop off the anti-rattle spring.
4. Remove the dust caps, back out both guide bolts and lift the caliper off. Hang it with wire; do not let it hang on the hose.
5. If you are replacing rotors, remove the two carrier bolts and the carrier, then the rotor retaining screw, and tap the disc off the hub.
6. Clean the hub face to bare metal, add a thin film of anti-seize, and fit the new rotor with its retaining screw.
7. Reinstall the carrier and torque its bolts. Clean the abutments, fit the pads with lube on the backing only, and compress the piston.
8. Refit the caliper, torque the guide bolts, refit the spring, and install the new wear sensor.
9. Pump the pedal until it is firm before the car moves, then check the fluid level.
10. Mount the wheels, tighten the wheel bolts to spec, and bed the pads in.

For bedding, Power Stop's guide for non-coated rotors calls for five moderate-to-aggressive stops from 40 mph to 10 mph, five moderate stops from 35 mph to 5 mph, then about five minutes of driving to cool without holding the brakes at a stop. Follow the instructions supplied with your own pads if they differ.

Parts to replace together

On a 335i the wear sensor is a single-use part in practice: the plastic clip goes brittle and rarely seats firmly in a new pad. Replace it every time you replace pads on that axle, or the dash brake warning will come back. Replace rotors whenever they are at or near the minimum thickness in the table above, or if they have a lip or vibrate under braking, and always in axle pairs.

Inspect the guide bolt boots and the spring clip; torn boots let water reach the guide bolts and can make the caliper drag. If the fluid is due under BMW's service schedule, flush it while the wheels are off.

For pads, we carry EBC Bluestuff NDX front brake pads for the 2006-2012 E90/E92/E93 335i, EBC Bluestuff NDX rear brake pads for the 2006-2012 335i and EBC Bluestuff NDX rear pads for the 2013-2018 F30 335i. You can also browse all brake pads, matching brake rotors and brake hardware kits.

Mistakes that cost 335i owners time

• Ordering by model name alone. A 335i could be an E9x or an F30, and an F30 could have standard or M Sport brakes. Check the rotor diameter or the build data.
• Reusing the wear sensor. It saves a few minutes and usually returns a warning light.
• Letting the reservoir overflow when compressing pistons.
• Skipping the hub cleaning. Rust on the hub face is a common cause of rotor runout and pedal pulsation. Power Stop cites a maximum lateral runout of .003 to .005 inch depending on the application.
• Using a "close enough" torque. Look up the factory value and use a torque wrench.

Frequently Asked Questions

Do E90 and F30 335i brake pads interchange?

No. Brembo lists different front and rear pads and rotor sizes for the E92 335i and the F30 335i, and the F30 has separate pads for its standard and M Sport brake packages.

How do I know if my F30 has M Sport brakes?

M Sport brakes have blue calipers and larger rotors: 370 mm front and 345 mm rear in Brembo's listing, against 340 mm front and 330 mm rear on standard brakes.

What is the minimum rotor thickness on a 335i?

Brembo lists 28.4 mm for the front disc on both generations. The rear is 20.4 mm on the E92, and 18.4 mm (standard) or 22.4 mm (M Sport) on the F30. Always check the value cast or stamped on your own rotor too.

Do I need to bleed the brakes after a pad change?

Power Stop's guide recommends bleeding whenever pads and rotors are replaced. At minimum, check the level and pump the pedal firm before driving.

Can I reuse the old pad wear sensor?

It is not recommended. Old sensors become brittle and often do not lock into new pads, which brings back the brake warning.

Sources

1. Brembo catalogue - BMW 3 Coupe (E92) 335i - E92 disc sizes, minimum thickness, 120 Nm tightening torque, pads and wear sensor references
2. Brembo catalogue - BMW 3 (F30) 335i xDrive - F30 standard and M Sport disc sizes, minimum thickness, wear sensor references
3. Brembo catalogue - BMW 3 (E90) 335i - E90 sedan application data
4. Power Stop brake kit installation guide - job sequence, torque-to-manufacturer-spec guidance, runout range, bleeding and bed-in steps