I posted a few weeks ago about my BRAKE light coming on, on the dash. Now my pedal goes to the floor. I know I should haver added fluid earlier, but whatever. My question is can I add fluid now?????

Ben Maggos
300 SDL
205,000 mi.

If the master is empty the fluid went somewhere. Fill it back up and have a helper press the brake pedal as you watch for leaks.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

No, too late. I think air have been sucked in. Need to bleed the lines and check for leak.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

The brake system does not consume any fluid in the normal course of operation, although the fluid level will lower slightly as the brake pads wear and the fluid capacity of the calipers increase.

That being said, if you are losing brake fluid you have a serious problem and you must find out where it is leaking and remedy the problem, you can't just add more fluid and keep driving.

As mentioned earlier, if fluid is getting out, that means air can get in, so brake bleeding will be necessary.

Don't procrastinate on fixing something as important to your safety (and other's) as the brakes.

kingdoc put forth some EXCELLENT advice. Please follow it. We don't want anyone here hurt or worse.

I agree. Simply adding fluid at this point will not restore normal operation and my guess is a hard line has rusted through somewhere.

-Jason

__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

Are you out of fluid, or just low? If you're out or very low, like these guys said, definitely locate the leak before doing anything else. Check around the master cylinder, hard lines and rubber lines, as well as calipers. It might not be that hard a fix. When you're sure you have no leaks, fill up and do a flush/bleed. You'll have air in your system which has to be bled out.
Also check your brake pads ... if they're real low, that can make the fluid level drop as well as increase pedal travel. Wouldn't hurt to do a check of all components anyway ... pads, rubber lines, discs, make sure calipers aren't stuck. Brakes are something you want to stay on top of.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

Keep an eye on the Master Cylinder too, they have been known to leak into the booser, which isn't cheap...

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

Get to the root cause, please. A temp fix can mean an accident . Be sure to locate, repair, refill, bleed refill, bleed etc etc

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Strelnik
Invest in America: Buy a Congressman!

1950 170SD
1951 Citroen 11BN
1953 Citroen 11BNF limo
1953 220a project
1959 180D
1960 190D
1960 Borgward Isabella TS 2dr
1983 240D daily driver
1983 380SL
1990 350SDL daily driver alt
3 x Citroen DS21M, down from 5
3 x Citroen 2CV, down from 6