What keeps air from going through the threads on bleeder screw when releasing pedal?

if you have a crumby bleeder screw and brake calipers that has a lot of high tolerance in between the threads then some air can get thru the threads. just don't unscrew the bleeds screw/zerk all that much. you can tell if the threads were cut with a crappy tap on the caliper when you get brake fluid to also leak around on the threads. I know that the FJ cruisers have that issue from personal experience, but haven't really had a hard time with while brake bleeding other vehicles.

Is it supposed to weep out brake fluid out of the top while your bleeding brakes? Mine does between the black plastic nipple and the red cap.

The black plastic nipple is a vent to relieve pressure as the bottle fills with fluid forced in through the center hose. I usually empty the bottle when it's about half full so brake fluid never gets near the vent. This bottle has been used extensively and I have yet to see any fluid weep around the vent.I hope this helps.

Does this have a one way check valve to keep fluid from going back into the caliper when depressing the brake pedal?

Yes, it worked great. Was able to bleed the brakes without any help.

Should the bottle be positioned above or below bleeder valve?

above the bleeder valve works better

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Allstar Performance ALL11017 Bleeder Bottle with Magnet and Check Valve, White

Allstar Performance ALL11017 Bleeder Bottle with Magnet and Check Valve, White

Product ID: 299101814

Details

Bottle type
Brake Bleed
Brand
Allstar
Capacity
454 g
Colour
White
Material
Plastic

💧One-way check valve prevents air entry

📏12" flexible hose fits most valves

🧲Magnet retainer for secure placement

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฿5014

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Bleed like a pro—no crew needed, just precision and control!

OPTIMAL FLUID CAPACITY - 16 oz reservoir holds ample brake fluid for multiple bleed cycles without constant refills.
COMPACT LIGHTWEIGHT DESIGN - At just 130g and sleek dimensions, it’s easy to handle and store in your toolkit.
UNIVERSAL FIT FOR ALL VEHICLES - 12" flexible hose adapts seamlessly to most bleeder valves—no compatibility worries.
AIR FREE BRAKE SYSTEM GUARANTEE - Built-in check valve stops unwanted air from entering, ensuring smooth, safe braking.
EFFORTLESS ONE PERSON BRAKE BLEEDING - Magnet and check valve combo lets you bleed brakes solo with zero hassle.

The Allstar Performance ALL11017 Bleeder Bottle is a professional-grade brake bleeding tool featuring a magnet retainer and one-way check valve for efficient, one-person operation. Its 16-ounce capacity and 12-inch flexible hose fit most bleeder valves, preventing air contamination during brake fluid replacement. Lightweight and universally compatible, it’s a must-have for any serious vehicle maintenance kit.

Specifications

ASIN	B00F9XHVKA
Additional Features	Check Valve
Age Range Description	Adult
Best Sellers Rank	#46,806 in Automotive ( See Top 100 in Automotive ) #54 in Automotive Brake System Bleeding Tools
Bottle Type	Brake Bleed Bottle
Brand Name	Allstar Performance
Capacity	454 g
Color	White
Container Type	Liquid
Country of Publication	USA
Customer Reviews	4.6 4.6 out of 5 stars (2,322)
Finish Types	White
Global Trade Identification Number	00848238056792
Included Components	Brake Bleeder Bottle, Magnetic Mount, Check Valve / Plastic Tubing
Item Dimensions W x H	15.2W x 6.4H centimeters
Item Type Name	Bleeder bottle
Item Weight	0.13 Kilograms
Manufacturer	Allstar Performance
Manufacturer Part Number	ALL11017
Material Type	Plastic
Material Type Free	Bisphenol A (BPA) Free
Model Name	ALL11017
Model Number	ALL11017
Number of Items	1
Number of Packs	1
Part Interchange Info	ALL11017
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	Workouts
Reusability	Reusable
Shape	Cylindrical
Specific Uses For Product	Automotive brake bleeding
Style Name	Magnet and Check Valve
Theme	Automotive
UPC	763273188096 848238056792
Unit Count	1 Count

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