How to Flush Brake Fluid Yourself: Cost, Tools, and Step-by-Step Guide
A DIY brake fluid flush costs $10 to $20 for fluid versus $70 to $150 at a shop. Here is everything you need, step by step.
DIY vs Shop: Cost Comparison
DIY (Fluid Only)
$10 to $20
If you already have tools
DIY (First Time)
$25 to $45
Fluid + bleed kit + wrench
At a Shop
$70 to $150
Parts + labor
Your savings: $45 to $130 per flush. A bleed kit pays for itself the first time.
Tools and Materials Checklist
| Item | Approx. Cost | Notes |
|---|---|---|
| Brake fluid (correct DOT type) | $6 to $25 | 1 quart minimum. Check your reservoir cap for the correct type. |
| Vacuum brake bleeder or one-person bleed kit | $15 to $25 | Mityvac or similar. Pays for itself the first time you use it. |
| Box wrench set (8mm, 10mm, 11mm) | $10 to $20 | Common bleed screw sizes. A flare nut wrench is ideal to avoid rounding. |
| Clear tubing and catch bottle | $5 to $8 | For gravity bleeding. Let you see when old fluid turns to new. |
| Jack and jack stands | $40 to $80 | If you do not already own them. Essential for any brake work. |
| Turkey baster or large syringe | $3 to $5 | For removing old fluid from the reservoir before filling with new. |
| Shop towels and nitrile gloves | $5 to $10 | Brake fluid strips paint on contact. Keep towels around the reservoir. |
Not sure which fluid type to buy? Check our DOT type guide
Step-by-Step Process
Gather tools and identify your fluid type
Check the cap on your brake fluid reservoir or your owner's manual. Buy the correct DOT type. You will need at least 1 quart, possibly 2 for a full flush. Do not mix DOT 5 (silicone) with DOT 3, 4, or 5.1 (glycol). DOT 3, 4, and 5.1 are compatible with each other.
Remove old fluid from the reservoir
Open the hood and locate the brake fluid reservoir (usually on the driver's side, near the firewall). Use a turkey baster or large syringe to remove as much old fluid as possible. Do not let the reservoir run dry at any point during this process.
Fill the reservoir with fresh fluid
Pour fresh brake fluid into the reservoir until it reaches the "MAX" line. Keep the bottle of fresh fluid nearby. You will need to top off the reservoir multiple times during the bleeding process.
Start bleeding at the furthest caliper
Start with the wheel furthest from the master cylinder (typically rear passenger side). Remove the wheel, locate the bleed screw on the caliper, attach your bleeder hose, and open the screw about a quarter turn. Use the vacuum pump or have a helper press the brake pedal to push fluid through.
Bleed each caliper in order
Work in order from furthest to closest to the master cylinder: rear passenger, rear driver, front passenger, front driver. For each caliper, pump until you see clean, clear fluid coming through the tubing with no air bubbles. Close the bleed screw before moving to the next wheel.
Check the reservoir between each wheel
After bleeding each caliper, check the reservoir level and top it off. If the reservoir runs dry, you will introduce air into the system and have to start over. Keep it at or near the MAX line throughout.
Check pedal feel
After bleeding all four corners, pump the brake pedal several times. It should feel firm and consistent. If the pedal feels spongy or sinks slowly, you have air in the system. Re-bleed the calipers until the pedal firms up.
Top off and clean up
Fill the reservoir to the MAX line. Replace the cap. Clean up any spilled brake fluid immediately, especially from painted surfaces. Reinstall all wheels and torque the lug nuts to spec. Take a slow test drive and confirm braking feels normal before driving at speed.
When NOT to DIY
A brake fluid flush is moderate difficulty. It is not a beginner-level job. Consider paying a shop if any of the following apply:
ABS scan tool required
Some vehicles (especially BMW, Audi, VW) require a scan tool to purge the ABS module. Without it, you cannot fully replace the fluid in the ABS pump. A shop with the right scan tool can do this in minutes.
Rusted or seized bleed screws
If your bleed screws are rusted shut, forcing them can snap them off inside the caliper. A mechanic has the tools and experience to deal with seized hardware. A broken bleed screw turns a $15 job into a $300 caliper replacement.
First time doing brake work
If you have never worked on brakes before, a fluid flush is not the best starting project. Air in the brake lines can cause brake failure. Consider doing your first flush alongside an experienced friend, or watch the process at a shop first.
No jack stands
Never work under a car supported only by a jack. Jack stands are non-negotiable. If you do not own them and are not planning to buy them, this is a shop job.
Common DIY Mistakes
Letting the reservoir run dry
If the master cylinder reservoir empties during bleeding, air enters the system. You then have to start over. Check the level between every caliper.
Using the wrong fluid type
DOT 5 (silicone) will damage a system designed for DOT 3/4/5.1 (glycol). Always check the cap or manual. DOT 3, 4, and 5.1 are interchangeable, though mixing grades reduces performance to the lower spec.
Not bleeding all four corners
Old fluid in even one caliper means the system is not fully flushed. Bleed all four, in order, every time.
Spilling fluid on paint
Brake fluid is a paint stripper. It will damage clear coat and paint within minutes. Keep towels around the reservoir and wipe up spills immediately.
Skipping the pedal check
Always check pedal feel after bleeding. A spongy pedal means air in the lines. Do not drive until the pedal is firm.