-
Hi Guest !
Welcome to the 500Eboard forum.
Since its founding in late 2008, 500Eboard has become the leading resource on the Internet for all things related to the Mercedes-Benz 500E and E500. In recent years, we have also expanded to include the 400E and E420 models, which are directly related to the 500E/E500.
We invite you to browse and take advantage of the information and resources here on the site. If you find helpful information, please register for full membership, and you'll find even more resources available. Feel free to ask questions, and make liberal use of the "Search" function to find answers.
We hope you will become an active contributor to the community!
Sincerely,
500Eboard Management
Fabric Covered Brake Hose from Brake Fluid Reservoir
- Thread starter Jlaa
- Start date
P/N: 009-997-38-82 and you'll get 1 meter, but only need 110-125mm of it.
You'll need to pressure-bleed the entire brake system after replacing this, and pull 200cc+ from each caliper. 2 quarts/liters of your favorite DOT4/4+ fluid will do it. Pick up the Motive Euro kit, or something similar, if you don't already have a pressure bleeder.
You'll need to pressure-bleed the entire brake system after replacing this, and pull 200cc+ from each caliper. 2 quarts/liters of your favorite DOT4/4+ fluid will do it. Pick up the Motive Euro kit, or something similar, if you don't already have a pressure bleeder.
Thanks.
The slope is slippery ----
I was going to replace the calipers / pad with rebuilt silver arrows / akebono pads and figured at the same time that I would just replace the fabric hose. I have an old pressure bleeder cap (to hook up to compressed air) that I bought from Steve D (or G?) of the Ultimate Garage about 15 years ago.
In conjunction, I am chasing a slight squeak, or mini-fart sound when depressing the brake pedal --- 75% of the time --- when the engine is on. I suspect that there is some seal or something making a slight noise in the vacuum booster or the master cylinder (that said the master cylinder is only 10K miles old).
I started by reading this old thread on the 500E board (which borrowed a thread from MBworld) -which suggested shooting some lubricant in the gap between the master cylinder and the vacuum booster after loosening the master cylinder back a few millimeters. Being uncomfortable with introducing lubricants into the vacuum booster, I did some more googling...
...and then I read a reference on some GM discussion boards that this squeak is a common occurrence on some GM SUVs that was ultimately solved via GM TSB by using a reformulated brake fluid with different lubricity characteristics --- http://www.traverseforum.com/index....ic=9314.0?thememode=mobile;?thememode=mobile; --- this fluid though is unfortunately a DOT3 fluid.
Currently the car has Pentosin DOT4 LV fluid in it, with a viscosity of 700 nm^2/s @ -40C. I don't think this is the correct fluid --- I think this low viscosity fluid is for more modern cars with superfine (human hair sized) passages in the ABS/ASR systems. In fact looking at the data sheet, the Pentosin DOT 4 LV fluid is not MB certified --- http://www.pentosin.net/specsheets/Pentosin_Dot4_LV.pdf Indeed, ATE SL6 is also a low viscosity fluid with a viscosity around 700 nm^2/s http://www.ate-brakes.com/media/2310/download_broschuere_bremsfluessigkeit_en.pdf
I was, at the same time, going to swap back in some regular "high viscosity" brake fluid in. Either
- ATE TYP200 DOT4, which has a viscosity of 1400 nm^2/s
- http://www.ate-brakes.com/media/2310/download_broschuere_bremsfluessigkeit_en.pdf
- Motul RBF600 DOT4 - 1750 nm^2/s
- https://www.motul.com/system/produc...inal/RBF_600_Factory_Line_(GB).pdf?1340122148
- Pentosin Super DOT4 - 1500 nm^2/s.
- http://www.pentosin.net/specsheets/pentosin_superdot_4.pdf
I'm not really sure if the brake fluid will make any difference with the mini-fart sound, but I figured I would start there and eliminate variables.
The slope is slippery ----
I was going to replace the calipers / pad with rebuilt silver arrows / akebono pads and figured at the same time that I would just replace the fabric hose. I have an old pressure bleeder cap (to hook up to compressed air) that I bought from Steve D (or G?) of the Ultimate Garage about 15 years ago.
In conjunction, I am chasing a slight squeak, or mini-fart sound when depressing the brake pedal --- 75% of the time --- when the engine is on. I suspect that there is some seal or something making a slight noise in the vacuum booster or the master cylinder (that said the master cylinder is only 10K miles old).
I started by reading this old thread on the 500E board (which borrowed a thread from MBworld) -which suggested shooting some lubricant in the gap between the master cylinder and the vacuum booster after loosening the master cylinder back a few millimeters. Being uncomfortable with introducing lubricants into the vacuum booster, I did some more googling...
...and then I read a reference on some GM discussion boards that this squeak is a common occurrence on some GM SUVs that was ultimately solved via GM TSB by using a reformulated brake fluid with different lubricity characteristics --- http://www.traverseforum.com/index....ic=9314.0?thememode=mobile;?thememode=mobile; --- this fluid though is unfortunately a DOT3 fluid.
Currently the car has Pentosin DOT4 LV fluid in it, with a viscosity of 700 nm^2/s @ -40C. I don't think this is the correct fluid --- I think this low viscosity fluid is for more modern cars with superfine (human hair sized) passages in the ABS/ASR systems. In fact looking at the data sheet, the Pentosin DOT 4 LV fluid is not MB certified --- http://www.pentosin.net/specsheets/Pentosin_Dot4_LV.pdf Indeed, ATE SL6 is also a low viscosity fluid with a viscosity around 700 nm^2/s http://www.ate-brakes.com/media/2310/download_broschuere_bremsfluessigkeit_en.pdf
I was, at the same time, going to swap back in some regular "high viscosity" brake fluid in. Either
- ATE TYP200 DOT4, which has a viscosity of 1400 nm^2/s
- http://www.ate-brakes.com/media/2310/download_broschuere_bremsfluessigkeit_en.pdf
- Motul RBF600 DOT4 - 1750 nm^2/s
- https://www.motul.com/system/produc...inal/RBF_600_Factory_Line_(GB).pdf?1340122148
- Pentosin Super DOT4 - 1500 nm^2/s.
- http://www.pentosin.net/specsheets/pentosin_superdot_4.pdf
I'm not really sure if the brake fluid will make any difference with the mini-fart sound, but I figured I would start there and eliminate variables.
Last edited:
The squeak / mini-fart (LOL!) noise you describe is not uncommon on the 124 chassis. I don't know if there is a definite cure, but IMO it isn't likely to be fixed by spraying anything inside the booster vacuum chamber. Seems like it's under the dash to me, but I really don't know. I also doubt fluid type will have any affect on the noise, the fluid is all located outside the passenger compartment (including the MC) and the noise I hear is inside, not outside. I would like to get Klink's thoughts though, as described in the previous thread.
The fluids you mention should be fine, btw. Or just use OE MB fluid, it's not particularly expensive, and the wet boil point (180°C/356°F) is right in the middle of your other three. Odd that the car curently has the LV fluid, I agree, that is probably not correct for the early 90's systems.
The fluids you mention should be fine, btw. Or just use OE MB fluid, it's not particularly expensive, and the wet boil point (180°C/356°F) is right in the middle of your other three. Odd that the car curently has the LV fluid, I agree, that is probably not correct for the early 90's systems.
Yeah, the thread you just mentioned is the same thread that I referenced about lubricants in the vacuum booster --- I'd appreciate Klink's thoughts as well.
The reason why I don't think that the mini fart is hinge related is because it only happens when the engine is running. I cannot duplicate mini fart with the engine off. It only farts while the engine is on. Well, first I need to drop that lower knee bolster and lubricate everything just to be sure (geez, that thing ain't budging! I took out two screws late at night and couldn't get the thing to budge --- I have an aversion to excessive force because in my all-thumbed-experience, force always means breaking plastic clips!
)
Yes, that is correct. And for me (my car) it happens when the engine is warmed up/hot. The brake-pedal fart does not occur when the engine is cold.
