The switch to braided steel brake lines from Fischer Hydraulics This is one of the most effective measures for optimizing your braking system. Unlike rubber hoses, braided steel brake lines do not expand under pressure, which leads to a constant, precise pressure point leads to – even under high thermal stress on the racetrack or during mountain pass descents.
🛠️ Preparation & Required tools
Brake work requires utmost care. You will need:
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Open ring wrenches (line wrenches): Mostly 11mm and 14mm. Do not use simple open-end wrenches to avoid rounding off the union nuts!
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Brake cleaner & Collection container: For leaking brake fluid.
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New copper sealing rings: (Usually included in the fishing set).
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Brake bleeding device or bleeder bottle: For safe venting of the system.
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Fresh brake fluid: Pay attention to the manufacturer's instructions (z.B. DOT 4, DOT 5.1).
⚙️ Assembly focus: The professional replacement
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Avoid pollution: Clean the connections thoroughly before disconnecting the old cables.
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Twist-free installation: When tightening the bolts, ensure that the braided steel brake line is not twisted. It must be able to move freely with every steering input and during compression and rebound of the suspension.
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Tightening torques: Tighten the banjo bolts and union nuts according to the manufacturer's specifications. "After tight comes stripping" applies particularly to fine brake threads.
🩸 The core task: bleeding the brake system
After replacing the pipes, there is air in the system. This must be completely removed.
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Sequence: Always start with the wheel furthest from the master brake cylinder (usually: rear right -> back left -> front right -> front left).
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Procedure: Bleed the brakes until the brake fluid... blister-free and clearly emerges from the vent valve.
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ABS/ESP block: In modern vehicles, a bleeding device with slight overpressure (approx. 1-2 bar) is often necessary to remove air from the fine valves of the ABS block.
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Pedal feel: After bleeding, the brake pedal must have a hard, defined pressure point and must not "give way" when constant pressure is applied.
❓ Frequently Asked Questions (FAQ)
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Is registration required? Most Fischer hydraulic kits for passenger cars come with a ABE (General Operating Permit) delivered. Registration with the TÜV (German Technical Inspection Association) is not required, provided the rest of the braking system is standard.
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How long do braided steel brake lines last? Virtually unlimited. The stainless steel mesh protects the inner Teflon tube (PTFE) from marten bites, UV radiation and mechanical influences.
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Can I mix the brake fluids? Never mix silicone-based fluids (DOT 5) with conventional fluids (DOT 4/5.1).
🏎️ Professional tips for converting to braided steel brake lines
| Theme | Expert advice |
| Fluid level | Keep a constant eye on the fluid level in the expansion tank during the bleeding process. If the system draws in air, you'll have to start over. |
| Paint protection | Brake fluid acts like paint stripper. If any drips onto the paintwork or brake calipers, rinse immediately with plenty of water or brake cleaner. |
| Leakage test | After assembly, clean all connections thoroughly with a dry cloth. Apply the brake firmly several times and check all connections for moisture. |
