Brake fluid change procedure

Important notes

Depressurize booster circuit before changing the brake fluid.

Do not depressurize by actuating the brake pedal but rather at the bleeding valve of the pressure accumulator. This will allow part of the old brake fluid to be drained. Caution: Start by filling the accumulator completely (with ignition key in position 1, actuate brake pedal until pump starts to run). After the pump has switched off, pull off electrical connector and release pressure completely from accumulator vent valve. Open bleeder valve slowly and keep bleeder hose in place.

Caution: A pressure of up to 180 bar is present in the system.

Wear goggles and protective gloves!

348-47

To allow the brake fluid to be changed in a rapid and practical manner, a filling and bleed ing device should be used.

If the booster circuit has not been depres-surized completely, do not actuate the brake pedal while the bleeder device is connected.

Changing the brake fluid: 1st step

With the booster circuit depressurized, top up with fresh brake fluid to upper edge of reservoir. Connect bleeder device to reservoir.

Clamp the overlow hose / bleeding hose shut with a hose clamp. The overflow hose / bleeding hose has been omitted as of October 1995; refer to Technical Information, Group 4, No. 16/95. Switch on bleeder device. Bleeding pressure: approx. 1.5 bar.

Use a recipient bottle to allow the escaping brake fluid to be checked accurately for cleanliness and freedom from bubbles and to determine the quantity of brake

Fluid change quantity per wheel:

Bleed at both bleeder valves on each

Caution: Pump the break pedal at least 10 times over its full travel after opening the first bleeder valve. This additional operation is only necessary for vehicles with hydraulic brake boosters and then only for the first bleeder valve.

Also drain some brake fluid from bleeder valve of clutch slave cylinder (approx. 50 cc).

Meyers Pump Hydraulic Fill
2004-47

Switch off and disconnect bleeder Remove hose clamp from overflow

Changing the brake fluid: 2nd step

With the bleeder device switched on, drain approx. 200 cc brake fluid at pressure accumulator. For this purpose, connect electrical connector to pressurizing pump with ignition key in position 1. As soon as the specified quantity has been drained, pull off connector and close bleeder valve.

Fill pressure accumulator completely by connecting the electrical connector.

After the pump unit switched off, correct brake fluid level. Never top up beyond the "Max. mark".

Porsche 993 Tank
2003-47
Porsche Classic Models

Porsche Classic Models

The History of Porsche Cars through its generational changes. A must have ebook for any Porsche fanatic, this ebook is a reference book for Porsche enthusiasts. Discover all there is to know about the greatest Porsches ever made. All models are fully described and illustrated providing a definitive production history plus an accurate guide to original specs and equipment.

Get My Free Ebook


Responses

Post a comment