Brake fluid reservoir with baffle

  • 2001 AUDI A4
  • 1.8L
  • 4 CYL
  • 4WD
  • 186,000 MILES
I was draining the fluid out of my brake fluid reservoir, and half is inaccessible.
It has a baffle. Does it drain? How to you drain and refill if at all?
Do you
have the same problem?
Thursday, January 14th, 2021 AT 11:30 AM

1 Reply


You need dot 4 type brake fluid about 1 liter(33.8 oz), remove all 4 wheels, open the brake fluid reservoir fig 1.
Note: the brake fluid reservoir must be kept adequately filled to prevent air from entering the brake system through the reservoir.
Use US 1116 brake bleeder tool.
Connect the tool on the brake fluid reservoir and switch on. The sequence described below must be followed for all four brake calipers.

1. Right rear brake caliper
2. Left rear brake caliper
3. Right front brake caliper
4. Left front brake caliper

Attach bleeder hose from the brake fluid collector to bleed screw open bleeder screw and allow about 250cc (15 oz)of brake fluid to drain out. The action of the pumping in new brake fluid flushes the used brake fluid out of the system.
Close bleeder screw, turn off the bleeder tool, check brake fluid level and close the cap.
Check brake pedal pressure and pedal free play max free play 1/3 of pedal travel.
If you don't have the bleeding tool, procedure will be carried out by a helper to pump the brake pedal and to open the bleeder screw on the brake caliper.
Pump the brake pedal for approximately 5 times, pedal pressed open the bleed screw brake fluid will comes out, the pedal will go down, pedal must kept pressed down until the bleed screw closed continue same procedure until 250cc (15oz) collect from each caliper and use the same bleeding sequence as described above.
Fig 2 front caliper bleed screw location.
Fig 3 rear caliper bleed screw location.

Thank you
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Friday, January 15th, 2021 AT 7:01 AM

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