Master cylinder balance port blocked

Hello everyone!

I'm new here and really excited about this forum!

'For some time now, I've been experiencing problems with the brakes (the front brake discs get very hot, about 150 degrees Celsius, after a drive, and both are heating up evenly). There's a slight pulsating feeling when coasting.'
I already cleaned the brake calipers and installed new brake pads (the pistons moved freely). Unfortunately, it didn't help. The brake pedal has almost no play, and I suspect that the pressure builds up there over time.
As I've read in other posts, the cause of my problem is the bleed hole in the master cylinder.

My questions:
Is it possible to verschandeln the HBZ (balancing borehole) without disassembling it?
Will it be possible to bleed the entire braking system (after removing the hydraulic brake booster) using the rear wheel bleeding method?

I would be very grateful for any suggestions.

P.S. It's a Volkswagen Golf 3, manufactured in April 1993, with a 1Y engine, 64 horsepower, 180,000 km mileage, and without ABS.

Von Verstopfungen in der Ausgleichsbohrung hab ich noch nie gehört.
I would simply install a new master cylinder (or one from a salvage yard).

But I can tell you more about the process of bleeding the system:
You can do it using the "backyard method." Besides, you don't even have ABS.

However, a much more elegant method, according to the official procedure, involves applying pressure to the brake fluid reservoir.
You can easily do this yourself: Just go to a junkyard and find a lid from an expansion tank. Choose a lid made of thick material and without a sensor, for example, from an Audi 80 B4. Then, buy a tire valve.
You drill a hole in the lid and insert the valve. But you also need to seal the small hole in the lid.
Then screw the lid onto the container, apply 1-2 bar of pressure with a tire inflator, open the bleed valve on the brake cylinder (attach a hose beforehand), press the pedal a few times, and watch as it drains out .

Allegedly, the master cylinder can fail when using the "backyard method."

Hello Wolfi, and thank you for your quick reply!

I've also read before that the HBZ (presumably a specific product or substance) can cause problems when used with the 'Hinterhofmethode' (likely a specific cultivation or gardening technique).
The piston is sliding into areas where it has never moved before, and the dirt present in those areas is causing further problems.
Since I'm currently tight on funds, I wanted to avoid buying a new handheld barcode scanner. Getting one from Schrotti would be too risky in this case, as the work might have to be done twice. A new one costs around €140.
I've also been thinking about whether I could create something similar using a printing method.

Regards,

Suction cups.

Well, but if cleaning the HBZ (heating, ventilation, and air conditioning system) doesn't work, you'll have to do the job twice.
And crafting is really easy. It only cost me 1.50€ .
And one more thing: make sure you don't cut the hole too big, and when you apply pressure, you need to slightly lift the valve. Then, the pressure itself will cause it to seal.